Several months ago, I was connected with a PA alum who wished to donate a piece of Pre-Columbian Mesoamerican jewelry to the Peabody Institute. It is a gold pendant in the shape of a frog with a slightly unclear origin. It had been passed down within the family and was variably attributed to the Maya, as well as cultures in Panama and Columbia. The owner had the pendant appraised for insurance purposes in the 1960s and again in the 1980s. Each appraisal identified a different culture of origin and left me a little confused.
Now, admittedly, I know relatively little about Pre-Columbian Mesoamerican jewelry and was out of my depth to evaluate this potential donation. Thank goodness for networking!
My first step was to reach out to a couple members of the Peabody Advisory Committee who have expertise in Mesoamerica and Peru. Even if they could not identify the cultural origin of the pendant, I knew they could point me in the right direction. In collaboration with the Peabody’s director, Ryan Wheeler, it was decided that I should reach out to a professor emeritus, Dr. John Scott, at the University of Florida for evaluation. That was a solid plan.
Lots of photos were taken of every part of the frog pendant.
The final piece of the puzzle was to determine if the frog was actually made of gold. Again, that is outside of my expertise and I needed to find some help. Fortunately, Andover is home to several amazing jewelry stores. The wonderfully helpful Vice President of Service at Royal Jewelers, Dina, came to my rescue. She hooked me up with a jeweler who had technology to identify the metallurgic components of the pendant without causing any damage. Technology is great!
The result is that the frog is a mixture of gold and copper that is typical of tumbaga. Tumbaga is the name for a non-specific alloy of gold and copper that is very common in Lower Central American manufacture. The frog is 1,200-500 years old and probably originated in the Central Highlands or Atlantic Slope of Costa Rica.
The next step is to present all this information to the Peabody Collections Oversight Committee (PCOC) in October. The PCOC will then vote on whether or not to formally accept it into the collection. Hopefully, this frog will be making an appearance in a classroom soon!
Note – if you would like to learn more about Latin American art, check out some of Dr. Scott’s publications:
In the June 17, 1938 issue of The Phillipian, it was announced that Dr. Warren King Moorehead would be leaving his post as Director of the Department of Archaeology. This brought about the end of a long and prosperous career that saw Moorehead become an integral part of the Phillips Andover community and a major contributor to the field of archaeology as a whole.
Moorehead began his career in the 1880s when he studied at Denison University before becoming an assistant at the Smithsonian Institution and later the curator of the Ohio Archaeological and Historical Society (now the Ohio History Connection). He joined the Department of Archaeology at Phillips Andover at its inception in 1901 and was appointed as the first curator. In fact, he worked closely with Robert S. Peabody, the Department’s founder, to develop the idea of such an institution. During his time as part of the Department, Moorehead received a Master of Arts from Dartmouth and was made a Doctor of Science in 1927 by Oglethorpe University and again in 1930 by Denison University. He became the director of the Department after Dr. Charles Peabody stepped down in 1924.
The article that announces Dr. Moorehead’s retirement is not particularly long but does highlight some of the important aspects of his career. The article spends a majority of its content on his education and on his path to becoming the director. The article does include some of his other accomplishments, such as a partial list of publications, and a mention about his work with the US Board of Indian Commissioners. The article concludes by saying that his position within the archaeology community is undisputed and that he will be travelling to Europe with his wife for the summer.
Personally I was surprised with how Moorehead’s departure was presented in The Phillipian, particularly the brevity in which they describe his career. In the numerous issues of The Phillipian throughout the years that I have researched, it became clear just how much Moorehead fought for the rights of Native Americans and how he fought to bring the injustices committed against them to light. This was a frequently recurring topic for Moorehead and yet receives one sentence in his retirement article. This also occurs with his numerous archaeological discoveries from across the country. A significant aspect of Moorehead’s career was his participation in and leadership of numerous excavations and expeditions over the years and, unfortunately, that aspect receives little attention in this article, such as his work throughout New England, the Midwest, and Southeast. Although his methods do not meet today’s standards, Moorehead made multiple important contributions to the field that went unmentioned in his retirement article.
I think that the reason I was so surprised was that the reception that Moorehead received in this article differs from most of his other appearances in The Phillipian. Many of the articles that featured Moorehead over the years went into a fair amount of detail. Whether it was discussing a lecture or one of his expeditions, the reader was usually given more information. Moorehead was seemingly respected and well liked by the students, as evidenced in numerous articles praising his lectures, yet the announcement of his retirement is rather straightforward and relatively unemotional. One possible reason for this could be declining student interest in the Department over the few years prior to his retirement and his habit of giving very similar lectures every year. Moorehead’s sendoff did not mirror his depiction in previous issues of The Phillipian.
Warren King Moorehead was a staple of the Department of Archaeology from its inception in 1901 until his retirement in 1938 having served as both the curator and then as the director. He retired at the age of 72 and spent his brief retirement with his family before passing in January of 1939.
Check out the following Peabody blogs for more information and history about Warren K. Moorehead.
Like for so many of us, this summer has been a rather abrupt transition back to “normal” at the Peabody.
I returned to the office full time in July and had to hit the ground running to help support the other Peabody staff, welcome researchers, jump back into giving tours, and provide back up for Summer Session activities. It has definitely been a transition, but it feels good to have students, researchers, and volunteers back at the Peabody!
For the entire month of July, the Peabody hosted the Summer Session class Dig This! This Lower School initiative takes a closer look at different global case studies from across the ancient world to hone skills and understanding as a historian and archaeologist. Students then get to take part in excavating the lost Mansion House of Phillips Academy – the home of Samuel Phillips. It is always great to see these students get excited about archaeology every summer!
Beyond that, it was a joy to welcome our Cordell Fellows for 2021 – Dr. Arthur Anderson and Dr. Gabe Hrynick. Their research is on the Peabody’s Northeast Archaeological Survey conducted partially in Down East, Maine in the late 1940s. I won’t try to summarize their work here, but will instead refer you to a blog they contributed a couple years ago. Their work in July focused on fully documenting one site, Thompson’s Point. A real plus to hosting researchers is that they do some of the collections documentation work for me – I am looking forward to receiving a copy of all the item photographs they took!
“Normal” at the Peabody Institute also requires our volunteers to be around. We have all missed them this past year and are thrilled to welcome back our regular collections volunteers (and new ones!)
I don’t know how the next few months will look – mask or no mask, virtual or in-person – but it has been a real pleasure to jump back into the hectic schedule of the Peabody. Stay safe and healthy, everyone!
Pipe in mouth and axe in hand, a man in a tweed suit stands in front of a 1940s Dodge “Woody” station wagon brimming with suitcases and archaeological gear. The crates on the ground by his feet are labeled, “F. JOHNSON, PEABODY FNDN, ANDOVER, MASS.” Who is this man and where could he be traveling to?
The year is 1948 and this traveler in tweed is Frederick Johnson, curator of the Peabody (known as the Robert S. Peabody Foundation for Archaeology at the time) from 1936-1968.
Frederick Johnson (1904-1994) joined the Robert S. Peabody Foundation for Archaeology as Curator in 1936. He held this position until 1968, serving one year as Director before retiring in 1969. During his time at the Peabody, Johnson initiated an archaeological excavation program for students at Phillips Academy. He also organized the Committee for the Recovery of Archaeological Remains (1945-1968) and chaired the American Anthropological Association’s Committee on Radioactive Carbon 14 (1948-1968.)
Johnson is recognized for contributing to the development of an interdisciplinary approach to archaeology, using scientists from various fields to study archaeological problems together. The Boylston Street Fish Weir project (1939) in Boston, MA as well as the Andover-Harvard Yukon Expedition (1944 and 1948) were two examples of this method.
The image of Fred Johnson above was taken before his trip to the Yukon Territory for the last year of the Andover-Harvard Yukon Expedition. This five-month field project combined archaeological and geobotanical research in the unknown northwestern interior of North America and was carried out jointly by the Peabody and Harvard University (funded by additional sources, including the Wenner-Gren Foundation.)
The journey began from North Dakota to Burwash Landing, Yukon with research in parts of the Shakwak and Dezadeash Valleys in southwestern Yukon. The project leaders were Fred Johnson and Professor Hugh Raup, botanist and Director of the Harvard Forest in Harvard, MA. Two Harvard graduate students served as assistants in the botanical and archaeological research, Bill Drury and Dr. Elmer Harp, Jr.
Harp was a recent Harvard graduate and Curator of Anthropology for the Dartmouth College Museum in Hanover, NH. He documented the trip through field notes and his own photographs. Below is one of Harp’s photographs taken at the beginning of their trip. Do you notice anything similar between these two images? That is the same station wagon in each photograph and yes, that is Fred Johnson with his pipe again! Harp and Drury were tasked with driving the expedition’s station wagon from Boston to Whitehorse, Yukon Territory – standard labor assigned to graduate students in the field.
According to Harp’s recordings from the expedition, Johnson and Raup conducted several projects in the early years of the Yukon project (1943-1944) exploring for evidence of the first appearance of humans in the New World. The 1948 project was to search for archaeological sites along the eastern borders of the Rocky Mountains via the Alcan Highway. This was the first time the highway was opened to civilian traffic since the beginning of WWII. The Andover-Harvard expeditions went on to represent the first systematic explorations of Yukon’s prehistoric past.
In January, the HVAC system in one of our collection storage areas malfunctioned. Repair work required that the system was turned off for several days. During this time, we monitored the objects for any changes. One vessel caught our eye.
Thanks to Marla’s experience with the collection, she noticed that previously documented spalling due to salt efflorescence was likely developing further (see figure). A quick look at older photographs confirmed that the damage had indeed progressed. The vessel was stored on open shelving and an inspection of the area around the object determined that no fragments had fallen completely off. We decided to rehouse the vessel in a box to buffer it against changes in environment during the current or future failure of the HVAC system.
Since I’ve encountered salt efflorescence a few times, I thought I’d add a bit more information. Porous materials, like bone, ceramic and stone, can absorb salt from various sources. Once inside, salts can be dissolved by moisture in the air through a process called deliquescence. Eventually, the water evaporates and the salt recrystallizes. In very porous objects, the salt crystals form on the surface. In objects where the surface is less porous than the underlying body, recrystallized salt can generate massive forces than can spall or pit the surface (Source: NPS Conserv O Gram 06/05 page 1). In worst case scenarios objects can disintegrate.
As I mentioned in an earlier blog, salts can enter porous objects through groundwater or seawater in buried or submerged contexts (Source: NPS Conserv O Gram 06/05 page 1). They are a major source of salt in archaeological collections such as ours. In the case of ceramics, food and water stored in objects during their pre-burial use life can also leave salt residues (Source: Minnesota Historical Society Page 2). Salts can be introduced to ceramics during manufacture through additives that modify the clay body and through water (Source: Minnesota Historical Society Page 2, Source: Digital Fire). Even clay itself can be salty. When I lived in Arizona, I can remember hearing a potter discuss that they would check their clay by tasting it to make sure it wasn’t too salty.
After ceramic objects are recovered during excavation, salts can continue to be added in archaeological labs and museums. Hydrochloric acid has been used to remove calcium carbonate, an insoluble salt that adheres to ceramics during burial that impedes analysis. An unintended result of this process creates calcium chloride, a soluble salt, which is absorbed into the ceramic matrix (Source: The International Institute for Conservation of Historic and Artistic Works- Studies in Conservation Page 172, Source: NPS Conserv O Gram 06/05 Page 2). I would be highly doubtful of repairs that were done years ago. Without detailed treatment records, who knows what glues were used and what contaminants they might introduce.
Deliquescence and evaporation of soluble salts can be greatly diminished by keeping the storage environment below 60% relative humidity and by reducing humidity and temperature fluctuations (Source: NPS Conserv O Gram 05/06 Page 3). However, there is a continued danger of efflorescence. Display cases and storage shelving made from wood have the potential to release acetic acids. This volatile organic compound has the potential to interact with soluble salts leading to precipitation even in controlled storage environments (Source: ICOM Committee for Conservation Page 640).
There may not be quick or inexpensive solutions to mitigate efflorescence. Our current plans for renovation of Peabody collections spaces call for the replacement of wood drawers and cabinets, but this is expensive. In regards to removing salt from objects, the traditional method is through a desalination wash or soak, wherein the object is immersed in distilled or deionized water until the salt level is reduced. This is a complicated process and shouldn’t be done without involving a conservator. Desalination risks removing important residues and compounds that can reduce the usefulness of the objects for future analysis and weaken the object (Source: NPS Conserv O Gram 05/06 Page 3).
Here at the Peabody we’ve taken steps to remove salt through dry brushing, environmental controls, and monitoring. In the future, we have plans to improve our storage space so that these issues will no longer be a concern.
You have probably heard of radio-carbon (C14) dating. An invaluable tool for contextualizing the past, C14 dating is a method for determining the age of an object containing organic material by measuring stable and unstable (radioactive) isotopes of Carbon. Developed by University of Chicago physical chemist Willard Libby in the 1940s, C14 dating was a game-changer for the field of archaeology. Libby received the Nobel Prize in Chemistry in 1960.
Instead of relying solely on relative dating – the basic concept that an object found below another is older than one found closer to the surface – archaeologists gained the ability to specifically identify a year range for organic artifacts. The Peabody Institute was a contributor to this work through past curator, Frederick Johnson, but that is a story for another blog.
Lately, I have been working to facilitate C14 dating on bone artifacts from Pikimachay Cave in the Ayacucho Valley of Peru at the request of the 2019 Cordell Fellow, Juan Yataco. Juan is revisiting work done in the Ayacucho Valley by Scotty MacNeish. Back in the 1970s, MacNeish made some pretty bold assertions about the dates of human occupation in that region. At the time, the C14 dates from animal bones supported his claims, but other archaeologists doubted whether those bones were associated with human occupation.
While Juan’s specialty is stone tools, he also wanted to use improved technology to obtain an updated date for Pikimachay Cave. Unfortunately, the first bone sent for testing failed to yield an appropriate collagen sample and could not be tested. A second bone is on its way now. Both bones were modified by humans and will provide a fascinating glimpse of the past. Fingers are crossed for a better outcome this time around!
Contributed by Marla Taylor and John Bergman-McCool
Every museum is full of stories and story-tellers. Our recent work in the inventory process has uncovered an old story that always gets my attention (Marla’s). But, before I begin, I must give credit to Eugene Winter, the Peabody’s late Curator Emeritus, who was a story-teller extraordinaire – I am sharing a shortened version of his memories. (Another time, I will tell you about the time Gene cooked his lunch in an active volcano or walked on a whale. The man was full of stories!)
In 1986, Gene welcomed a man named George McLaughlin into the Peabody. McLaughlin claimed to be creating a handbook on archaeology for the local Boy Scouts and was looking to photograph objects in the Peabody’s collection. As a teacher himself, Gene was happy to encourage this project and made arrangements for McLaughlin to return a couple weeks later to access the collection.
However, McLaughlin instead returned the next day and told the administrative assistant, Betty Steinert, that Gene had authorized him to examine the collection – alone. Over the next three days, McLaughlin helped himself to an unknown number of objects from the collection.
Less than a week later, Gene received a call from security at Yale’s Peabody Museum of Natural History. A man matching McLaughlin’s description had stolen artifacts from a grad student’s work area and ran out of the museum before he could be caught. Because McLaughlin had now crossed state lines, the FBI became involved.
Gene and Betty remembered that McLaughlin had used the Peabody’s phone to call his wife about being late for dinner. This crucial piece of information allowed the FBI to locate McLaughlin’s home. Fortunately, McLaughlin was arrested soon after these incidents and all materials in his possession were seized.
In total, McLaughlin victimized six institutions in New England and stole thousands of artifacts valued at over $800,000 in 1986 ($1.9 million in 2020 dollars). He intermingled the artifacts based on his own system and systematically removed their catalog numbers (often the best clue to their original home). By so drastically removing the objects from their context, it was a challenge to return the objects to their appropriate homes.
McLaughlin had kept his own version of a ledger identifying the objects and where they came from. And fortunately, Gene was able to recognize a dozen or so very specific objects from the Peabody’s collection. The FBI left it up to the victimized institutions to divide the material in McLaughlin’s collection. The Peabody ended up with nearly 1600 objects from McLaughlin.
Ultimately, McLaughlin was sentenced to a three year suspended sentence and four years of probation. He was also fined $10,000 and ordered to pay a small restitution to each institution.
And therein lays the origin of the Peabody’s FBI collection.
Having come across these materials during our inventory and rehousing project it was time for them to be cataloged by myself (John). One challenge confronted us: McLaughlin had removed any identifying numbers applied by the museums and applied stickers with his own numbers. As the objects were cataloged, a careful inspection was made for remnants of original numbers not completely obliterated during the removal process. There were many with tantalizing hints of legible numbers. In the end though, there were just a few objects with numbers clear enough to associate with our museum’s ledger.
The remaining majority of objects needed new numbers. As mentioned above, McLaughlin had organized the objects and transcribed them into a ledger of sorts. His ledger was too general to make a one-to-one comparison with our own museum’s ledger, but it served as the outline of our numbering system. We added our own prefix, indicating that these objects were stolen and returned by the FBI and followed that with the McLaughlin number. In that way the objects will always carry that part of their strange history.
One day while I was working in the basement of the Peabody, plugging away at inventorying drawers, I was listening to a podcast called Astonishing Legends. It was an episode titled “The Tall Ones” exploring the legends and lore surrounding giants around the world. It came as a surprise when I heard the hosts say the name W.K. Moorehead! My ears instantly pricked up.
The podcast hosts went on to cite a New York Times article written on July 14, 1916 under the headline “Find Horned Men’s Skulls: Remarkable Discovery by Archaeologists in the Susquehanna Valley”. The short article stated that Professor A.B. Skinner of the American Indian Museum, Rev. George Donehoo, Pennsylvania State Historian, and Professor W.K. Moorehead of the Phillips Andover Academy uncovered a burial mound at the Murray Farm site while conducting research at Tioga Point in the Susquehanna Valley. In the mound, they uncovered the remains of sixty-eight men, believed to have been buried around the year 1200 AD. According to the article, the average height of these men was seven feet, with many being even taller. Also found with the remains were very large stone celts and axes, further evidence of the men’s gigantic size. Perhaps most interesting of all, some of the skulls had two inch bone protuberances on their foreheads. Well, this was something to explore!
Looking through historical texts and documents, it is clear that giants have been a topic of interest for centuries. Not only are they mentioned in the Biblical story of David and Goliath, but in fairy tales such as Jack and the Beanstalk, and the legend of Paul Bunyan. One pervasive theory about giants is that they are actually Nephilim (also from the Bible), the offspring of an angel and a human. Even some historical figures such as Gilgamesh are thought by some to have been giants.
Many newspaper articles from across the country in the nineteenth and early twentieth centuries claim to have found giant skeletons. Some accounts even call them a lost race of giant people, but many others hypothesize that they were giant Native Americans. An eight foot tall Native American skeleton was said to be found in Towanda, Pennsylvania in 1822. A headline from The World newspaper on October 6, 1895, read “Biggest Giant Ever Known-Nine Feet High and Probably a Prehistoric California Indian.” Some, like the Cardiff Giant, which was actually a buried stone statue, were proven to be hoaxes. Yet the stories still remain popular. Even Captain John Smith, in his account of meeting the Susquehanncocks in 1608, described them as giant-like. But were there really giants roaming this land before us? Or horned giants for that matter?
After some further digging, it was discovered that the “horned giants” found by Moorehead and others at Murray Farm were not horned at all, nor were they giants. Professor Skinner wrote a corrected article for the New York Times but it was not as publicized as the original, so it is harder to find. Apparently while excavating the site, a workman shouted out “There are horns over his head!”, after discovering a bundle burial which had been covered with deer antlers. An excited visitor or reporter at the site heard this and asked another workman, who decided to play a joke and claim that the skeletons had horns growing out of their heads. Another version says that a disgruntled camp cook made up the story.
This explains the story about the horns, but what about the supposed enormous height of these individuals and the other accounts of giants found nearby? It is thought that these skeletons, as well as accounts of living “giant” Susquehannocks, were not giant at all, but just taller than average. At the time, the average height of most Europeans was about five feet six inches tall, whereas Native Americans were thought to average about six feet tall. While six inches is not that big of a difference, anyone taller than six feet may seem like a giant to the generally shorter Europeans.
Another reason for the discovery of “giant” skeletons is that these bones were often misidentified as human when they actually belonged to extinct animal species. It may seem far-fetched that anyone could misidentify a mammoth bone as that of a human, but other than the skull, human bones actually look very much like animal bones. So to someone not trained in osteology, a very large rib bone may seem like it is from a human skeleton. Many skeletal remains have been innocently misidentified this way, not only as giants, but as monsters or “Titans” as well.
Over time it seems that this giant narrative of Native Americans by Europeans was exaggerated and, coupled with misidentified animal bones, resulted in the discovery of “giant skeletons.” However, these so-called giant skeletons always seem to mysteriously disappear after being excavated, leading many to believe that they either never existed, were misidentified animal bones, or it was actually just a taller than average person.
After hearing the podcast, I did some digging of my own through Moorehead’s records, just in case I could find anything related to the “horned giants”. I found many documents related to the Susquehanna Valley expedition as well as correspondences between Moorehead, Skinner, and Donehoo. None of these documents ever mentioned the “horned giants” or the article written in the New York Times. I did find a picture of Professor Skinner holding a perfectly normal looking skull with no protuberances while at Murray Farm. Moorehead also wrote a short report of the excavation, and again, no mention of giants was found.
Even though the horned giants of Pennsylvania turned out to be nothing more than a tall tale (pun intended), it was fun to hear a story about Moorehead on one of my new favorite podcasts! I wonder what interesting stories I’ll uncover next!
The Centers for Disease Control and Prevention (CDC) issued guidelines to limit the spread of COVID-19, also known as the coronavirus. One recommendation included in these guidelines was for “social distancing” – a term referring to the conscious effort to reduce close contact between people and hopefully hinder the community transmission of the virus.
While schools, companies, and various workplaces determine the best possible options to both adhere to these guidelines as well as provide the appropriate support to their staff, students, and customers – many have chosen to close their doors. Some institutions and companies have shut down indefinitely, while various schools and universities have moved to remote teaching, where students complete their classes online and stay at home. Universities and colleges all over the country have moved courses to online platforms. Undergrads are being told to move out of their dorms and off campus for the remainder of the semester.
Phillips Academy (PA), a New England boarding school and the Peabody’s parent institution has instituted similar measures, following the directives issued by Massachusetts Governor Charlie Baker.
A local restaurant closes their doors in light of “on-site eating” bans over COVID-19
Now many would say they like working from home and actually get more done, but it is not the case for everyone. The Peabody staff are doing what they can to continue their museum work from home. For the Peabody collections team, it is very difficult to continue much of the work they do every day at the institution, as much of the collections and material cannot leave the building. While inventory, rehousing, and cataloguing of the collection is put on hold, our staff is editing object photographs, digitizing documents, transcribing collection ledgers, writing blogs (like this one), and more.
Outside of my remote-work, I am wondering like many others who are stuck at home – what else can I do with the rest of my week? By being at home, we miss out on the daily interactions with our coworkers, colleagues, and classmates. Our experiences with each other fuel our creativity and critical thinking, and are important for much needed collaborative efforts. Through “social distancing” we are recommended to not take part in every day, public activities such as eating out, going to the store, or visiting a museum or historical site with our friends and family.
But don’t let social distancing doom your week and weekend! Museums have found a way to bring some of their collections to their visitors. So worry no more! You can view that Van Gough from the couch!
I was happy to enjoy a little culture and education in my off-time while at home. According to Fast Company, Google Arts & Culture has teamed up with over 500 museums and galleries around the world to bring virtual tours and online exhibits to a global audience.
The first museum I “visited” was the Musée d’Orsay in Paris, France. As a student, I had visited this museum on a class trip many years ago and I was interested in the exhibits they provided online. This exhibit was a detailed history on the building of the museum titled, From Station to the Renovated Musée d’Orsay. This endeavor was a groundbreaking project for Paris as it was the first time an industrial building had been restored to accommodate a major museum. The virtual exhibit showcases the early building plans and images of the Orsay train station and hotel from the 1900s as well as images of the museum and its galleries after the renovation project in the early 2000s. Explore this virtual exhibit here!
I visited a second virtual exhibition, this time, at the National Gallery of Art in Washington, D.C. The exhibition is called, Fashioning a Nation. This exhibit features drawings from the Index of American Design, a collection of more than 18,000 watercolor pictures of American decorative art objects. This exhibition explores the American fashions from 1740 to 1895, giving insight into the character and quality of American life from the colonial period to the Industrial Revolution. Click here to explore this exhibit!
If museums aren’t your thing, explore a historic site!Open Heritage – Google Arts & Culture offers iconic locations in 3D, using 3D modeling techniques for you to explore. You can learn about the tools of digital preservation and how people all over the world are preserving our shared history. One site I visited was the Mesa Verde National Park. This site is home to Native American cliff dwellings in southern Colorado that span over 700 years of Native American history (600-1300 CE). An expedition was led by CyArk in February 2017. CyArk is a nonprofit organization that specializes in the digital documentation and preservation of historic sites. The organization documented the Balcony House at Mesa Verde using Light Detection and Ranging (LIDAR) and terrestrial photogrammetry. Combining these two technologies is what creates the 3D model of a site. To explore the 3D model of the Balcony House at Mesa Verde, click here!
Unfortunately, not all popular museums and galleries are included on Google Arts & Culture’s collection website, but some museums are offering virtual tours and online visits on their own websites, such as the Louvre in Paris, France. To see more of Google Arts & Culture’s collection of virtual museums and exhibits, visit their collection website. Explore and enjoy your visit!
Back in March I wrote a blog post summarizing efforts to rid collections objects of mold and salt uncovered during inventory and rehousing. We identified and isolated affected objects and cleaned them by dry brushing and vacuuming. The cleaned objects were rehoused in archival boxes that included a sachet of silica gel. The purpose of the gel is to reduce relative humidity (RH), thereby robbing mold and salt of the environmental conditions necessary for their growth. To better understand what the environment is like inside the boxes, we are monitoring their temperature and relative humidity with two data loggers. One is placed inside a box without silica gel and one is placed inside a box with silica gel. These conditions will be compared against a data logger that is recording general conditions in the basement not far from where these test boxes are located. We will be watching these data loggers over the coming year, but we already have some interesting results.
First, the boxes are working well as a buffer against relative humidity cycles. The graph above shows RH and temperature for the month of April; the basement is shown in red and the boxes with and without silica are blue and yellow, respectively. In April the RH in the basement was quite volatile. However, the RH inside the boxes is remarkably tranquil in comparison. The boxes are exhibiting small daily shifts of 1 or 2%, which is acceptable. Keeping RH from shifting dramatically is an important factor in collections care. Organic materials such as basketry, bone, and wood are hygroscopic, meaning that they can absorb and release moisture in the air. Rapid and large changes in RH can cause organic materials to swell and contract leading to damage such as cracking or delamination. It is best to keep collections from experiencing RH shifts exceeding 10% over a given month and on that count the boxes are doing a great job. As they are found, the most sensitive organic collections are being moved to another part of the museum that has a better environment.
The National Park Service recommends creating a layered approach to collections storage. Every enclosure within museum storage can act as an environmental buffer. The first enclosure is the building itself. It may seem pretty obvious, but keeping collections inside a building greatly reduces the effects of environmental factors. The same is true of every subsequent layer of enclosed storage. Here at the Peabody Institute we have wooden storage bays that, when closed, serve as another layer. The archival boxes act as a final layer.
Interestingly, the basement seems to be effective at buffering daily temperature cycles. The temperature in the basement has been hovering around 70 between February and June leaving little for the boxes to mediate.
The second finding of note is that the sachets of silica gel were spent faster than anticipated. As mentioned above sachets of silica gel were placed in the boxes with cleaned objects. The gel, in solid pebble-like form, starts out orange and as it absorbs water it changes to a deep blue. The expectation was that the gel would keep the RH at a reduced and steady level. The graph above shows that the silica gel was keeping relative humidity lower than that of the box without gel, but it is only a matter of a few percentage points. Most likely the boxes are not well enough sealed for the silica gel to more significantly moderate RH levels. The silica was active from mid-February until mid-April (see star on graph) when RH graphs inside both boxes started to match almost perfectly. A visual inspection in June indicated that the gel was spent. We replaced the silica in mid-June and it was spent within two weeks given the higher RH levels generally in the basement.
Our data shows that the boxes are acting as a significant buffer against potentially damaging cycles of increasing and decreasing RH levels. For now, we are forgoing replacing spent silica gel. Later in the fall we’ll see how the archival boxes work with our dehumidifiers at keeping mold and salt inducing RH at bay.