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the history of itinerant glassworkers

Tag: 1600s

This Dutch glassworker used a Cartesian diver as a magic trick

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As early as the 1670s, itinerant glassworkers were touring Europe demonstrating lampworking techniques to curious onlookers. A Dutch glassworker used this handbill to advertise his show in Wrocław, Poland, where he demonstrated at the Golden Sword (likely an inn or tavern). There, in the afternoons, the glassworker made glass eyes, weather-measuring devices, pots, bottles, and figurines.

handbill with text and two images of glassworkers blowing glass and using a cartesian diver

Dieser Hollaendische porcellain-glass-blaser, 1670? Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 112252.

Show highlights

He also displayed a relatively new scientific experiment: a Cartesian diver. The diver, seen in full on the right above, was created to demonstrate the relationship between density and buoyancy. But the Dutch glassworker didn’t explain the science behind the Cartesian diver to his audience. Instead, he treated it as a magic trick, in which the demonstrator commanded the figures in the bottle to move up and down by calling out orders. In reality, he used his hand to add or remove pressure from the air-tight membrane at the top of the vessel.

Woodcut images of a man pressing down on the top of a Cartesian diver to create pressure

The glassworker presses down on the membrane covering the top of the Cartesian diver to create pressure and cause the figures in the bottle to move. Detail of Dieser Hollaendische porcellain-glass-blaser, 1670? Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 112252.

The glassworker included several figurines in his bottle: a toasting man, a queen, and what looks like perhaps a bear or a devil. (Cartesian divers were also know as Cartesian devils, water devils, and bottle imps.)

One of the figurines in the Cartesian diver experiment.
One of the figurines in the Cartesian diver experiment.
One of the figurines in the Cartesian diver experiment.

Tools of the trade

The handbill shows that this glassworker used a lamp similar to the one described by Johannes Kunckel in his 1679 translation of L’Arte vetraria (The Art of Glass). The flame was likely fueled by oil or tallow pulled through a cotton wick and the glassworker could shape and direct the flame using forced air (either supplied by the use of bellows hidden under the table or by blowing into a pipe directed at the flame). This glassworker also used a small blowpipe to make his products.

The glassworker offered to demonstrate at private residences upon request, and sold his products to interested observers. There is no price listed to see the show, which matches with other known advertisements from the period.

The case of the glass eye smuggler

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And now for something completely different! Context posts are related to itinerant glassworkers in some – often tangential – way. Like a story about glass eye smuggling, a profile of a circus performer, or a post about the 19th-century roller rink craze.

In October 1911, United States customs agents arrested Bruno Schulze, a rather ordinary-looking business man, for smuggling 15,000 glass prosthetic eyes into the country. Over the next 12 months, the bizarre case of Schulze’s smuggling empire unfolded before a fascinated public.

Why would Schulze illegally import glass eyes? Lampworkers have been using glass to create prosthetic eyes since the 16th century. The material is durable, relatively comfortable, and, when shaped by an expert (called an ocularist), the resulting prosthetic is very realistic.1 German ocularists developed a special formula for glass that produced high-quality products, and their skills in making eyes were unmatched. So while ocularists created prosthetics in the United States, German-made eyes were more desirable. Schulze wanted to sell the best products, but wasn’t interested in paying the 60% duty charged by the U.S. government.2 So he hatched a plan to secretly bring the eyes into the country and spent more than a decade profiting from his scheme. Until customs agents caught on . . .

The “king” of glass eye smugglers

Black and white photo of Bruno “von Schoenewitz" and his signature

Bruno “von Schoenewitz,” 1909 and 1915 US passport applications. Source: Ancestry.com.

Name: Bruno C. L. Schulze
Alias: Baron von Schoenewitz (or the longer “Bruno Von Schoenowitz Freiherr Von Ungarswerth und Adlersloewen“)
Age: 43
Height: 5’7”
Eyes: Blue
Hair: Blond
Crime: Smuggling German-made glass eyes into the United States

Before the arrest

Customs officials had tracked Schulze for months, trying to pin him down. He’d been importing glass eyes for more than a decade, supplying ocularists around the United States. Some said he had a monopoly on the trade. Schulze was suspected of evading the 60% duty charged on foreign-made glass eyes. By doing so, he undersold other dealers and put many small firms out of business. Officials had finally gathered enough evidence to arrest him, thanks to a report from special Treasury agents who tailed Schulze in Europe while he bought 15,000 new glass eyes to sell on the American market. All that was left to do was find him . . .

Shallow box filled with glass prosthetic eyes

107 Glass Eyes with Box, Leopold Blaschka, possibly 1850-1887. Collection of The Corning Museum of Glass, 93.3.73.

October 30, 1911

Bruno Schulze was arrested as “Baron von Schoenewitz” upon his arrival in New York City on the steamship New Amsterdam of the Holland-American line. He was charged with smuggling 15,000 glass eyes into the United States.

An artist’s rendering of the steamship New Amsterdam. Source: captainalbert.com.
Passenger list for the New Amsterdam featuring “Bruno von Schoenowitz.” Source: Ancestry.com.

November 3, 1911

newspaper clipping

The Brooklyn Daily Eagle, November 5, 1911.

Customs agents raided Schulze’s Hoboken, N.J., “factory” (a front for his smuggling business) and found 14,000 glass eyes, foreign bills of sale, and other paperwork they could use to prove his guilt.3 Philip Stroh, a local printer, was arrested on a charge of conspiracy. He was suspected of being Schulze’s fence (or middleman). Agents arrived at his office too late to seize the documents they were looking for, instead finding the “office stove burning brightly with papers.”

November 4, 1911

Schulze and Stroh were both released on $5,000 cash bails.4

newspaper clipping

The New York Sun, November 5, 1911.

November 5, 1911

New York and Washington, D.C., newspapers picked up the story, calling Schulze the “king” of glass eye smugglers. They described him as a “Handsome and Distinguished Looking” gentleman with a high forehead; blond, curly hair; mustache, and “superconfident eyes of blue.”5 He was not what came to mind when they thought of a smuggler. Customs agents had a different opinion. They told the New York Sun that Schulze had been in trouble with them before, and described him as having a “defiant air and bulldozing and unusually egotistical manner.”

The New York Sun, November 5, 1911.
The Brooklyn Daily Eagle, November 5, 1911.

November 18, 1911

The National Glass Budget wrote that Schulze was awaiting trial before United States Commissioner Edward Russ at Hoboken. Agents reported that Schulze used employees of German steamers to secretly transport the eyes on and off the ships.6

Detail of Preis-Liste über Emaille-Augen mit schwarzer Pupille, L. W. Schaufuss, 1866. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 54006.

November 30, 1911

The story of Schulze’s arrest and the raid was reported around the nation. A reporter for the St. Paul Journal joked: “with all his eyes [Schulze] couldn’t elude the vigilance of the customs sleuths.”

December 3, 1911

newspaper clipping

Trenton (NJ) Evening Times, December 5, 1911.

Newspapers reported that customs special agent George P. Locke seized 600 glass eyes from the offices of St. Paul, M.N., optician W. H. Kindy.7 Kindy was not arrested, having purchased the eyes from Schulze without knowing of his criminal actions. Agents now estimated that Schulze smuggled 100,000 eyes into the country over the past 11 years, a $700,000 value. That meant Schulze owed the U.S. government about $420,000 in duties (roughly $10.5 million in today’s dollars).

January 5, 1912

newspaper clipping

The New York Sun, January 5, 1912.

Schulze’s problems were compounded when a customs inspector arrested him again, this time for importing glass animal eyes for less than half of their true value. Schulze’s bail was set at $10,000, which he was unable to pay. He was transported to the Tombs.8

February 17, 1912

Schulze was convicted on two counts for smuggling the shipment of 15,000 eyes into the United States. Prosecutor Mark P. Anderson believed Schulze would “get about all that the law allows.” The maximum sentence was four years with a fine of $10,000. Schulze’s associate, printer Philip Stroh, was reported to have supplied Schulze with “letterheads of a fictitious German manufacturer,” which he then used to get “false consular invoices” that undervalued the imported eyes.9

newspaper clipping

The New York Sun, February 19, 1912.

May 8, 1912

newspaper clipping

The New York Sun, May 9, 1912.

13,961 of the glass eyes seized in the raids were sold at a public auction in the Jersey City post office. According to the official announcement, only one eye in the lot was damaged. The Sun reported that the eyes “were packed in crates like strictly fresh eggs.”10 Two bidders split the lot, paying about 24 cents apiece. Buried at the end of the article was the news that Schulze was somehow able to escape and was at large.

June 4, 1912

The United States District Attorney’s office in Chicago filed United States vs. 2,659 glass eyes against the Geneva Optical Company for knowingly purchasing smuggled eyes from Schulze. The value of the glass eyes was set at $569. If the company could not successfully defend themselves, the eyes would be sold at public auction by the United States Marshal.

box with components showing how glass prosthetic eyes are made

Case of Glass Eyes, Tamworth Associates and F. and S. Danz, 1929-1940. Collection of The Corning Museum of Glass, 52.4.58.

October 4, 1912

newspaper clipping

The Montgomery (AL) Times, October 4, 1912.

Newspapers reported that the judge in the United States vs. 2,659 glass eyes case ordered the United States Marshals to auction off the eyes at a public sale.11

October 16, 1912

Bidder J. W. Sturtevant picked up all 2,659 glass eyes unopposed at the public auction. He paid the bargain price of $455. The Inter Ocean added some color, describing the eyes as “perfect blues, browns, grays, and blacks, and others with a blend of colors that never fail to attract.” From United States Marshal chief deputy John P. Wolf: “Are they not beautiful?”12

newspaper clipping

The Chicago Inter Ocean, October 17, 1912.

The end?

It is unclear what happened to Schulze, or whether he continued his criminal activities. In 1915, he used his alias to apply for a passport. His residence was listed as Philadelphia, P.A., and his occupation as merchant. After that, the trail dries up. Schulze/Schoenowitz fades from view.

glass prosthetic eye

Glass Eye, Leopold Blaschka, possibly 1850-1887. Collection of The Corning Museum of Glass, 93.3.73-24

So what do prosthetic eyes have to do with itinerant glassworkers? Several early glassworkers included glass eyes in their list of products. One such artisan not only made eyes of such quality “that they cannot be discerned from the Natural Eyes,” but also “he teacheth how [customers] may fix them in their Heads themselves, to the great Satisfaction of all persons that make use of them.”13 Spectacular!

Dieser Hollaendische porcellain-glass-blaser, 1670? Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 112252.
By Her Majesties Authority, [1702-1714]. Collection of the Winterthur Library.

Johannes Kunckel on the art of lampworking

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In 1679, Johannes Kunckel published his translation of Antonio Neri’s L’Arte vetraria (The Art of Glass): Ars Vitraria experimentalis, oder vollkommene Glasmacher-Kunst. Neri’s book was the first to focus solely on the subject of glassmaking and became an important manual for European glassmakers.14

Reprinted and translated into several languages, the book was owned by everyone from Galileo Galilei to Charles II, king of England. Each time the book was translated, the author would add his own glass knowledge, making L’Arte vetraria a living text. A chemist and director of a glassworks, Kunckel made his mark on the German translation by including the first-known description of lampworking.

Portrait of Johannes Kunckel, 1689. Source: Wikimedia Commons (N. van Werd) https://commons.wikimedia.org/wiki/File:Johannes_Kunckel_von_Löwenstern_Portrait.jpg
Ars Vitraria Experimentalis title page, 1743. Source: Wikimedia Commons (Johannes Kunckel) https://commons.wikimedia.org/wiki/File:Kunckel_Titelblatt_1743.jpg

In a section titled “On little glass blowing,” Kunckel writes:

“The technique of lamp blowing is not the most useful in the art of glass but it is a sector of glass art that makes it possible to create elegant objects. I shall offer a brief description here.

“First of all, one must procure small canes or perforated tubes, also partially solid, of good clear glass and of any kind of color in a furnace. The best pieces are those of broken Venetian glass. One needs a workbench (A), as can be seen in the illustration [below], where four or more persons can work, each with a lamp (B) fueled by colza oil or something similar, supplied by a robust wick of pressed cotton. Below the bench are bellows (D), driven by the craftsman by means of a pedal (E) that pushes the air through a small metal tube going across the bench. The end of the small tube is indicated as (C), inside of which another small tube that is curved forwards is inserted, ending with a narrow hole for the air to come out, which, striking the flame of the lamp the craftsman is working with, produces a concentrated and slim flame. The procedure is similar to the one adopted by a goldsmith to solder and cast metals. Once can also just use the mouth to blow on the tube. This results in a pointed flame that produces such a blazing heat that even the hardest glass softens.

“One takes a small glass tube and heats it in the flame at one end, while blowing at the other, thus creating a ball and anything else one desires, for example figurines, crucifixes, or small vases. Small tweezers and metal wire are also used to join the pieces of glass that the craftsman is heating in the flame. The small tube C is opposite each craftsman sitting at the bench. G is a small pulley with the rope that drives the bellows. F is a metal (or wood) funnel that is linked to a tube to allow the smoke and vapors from the lamp to escape. This art requires great study and an expert teacher.”15

Engraving of lampworking setup with three people around a wooden table, underneath which are bellows. On the table are three lamps which the people are using to shape glass.

Engraving of a lampworking workshop, Ars Vitraria Experimentalis, Johannes Kunckel, 1689. (Figure X opposite page 398.) Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 81288.

Kunckel’s description of lampworking has been quoted, translated, and copied countless times, influencing the reputation of this art for generations.16

Read Kunckel’s text in the original German17 and explore other editions of Antonio Neri’s L’Arte vetraria. For more on Neri and his work, visit Paul Engle’s website, Conciatore.org.

How it works: Cartesian diver experiment

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What is a Cartesian diver?

cartesian diver illustrated

Source: Elementary Treatise on Natural Philosophy Part I, A. Privat Deschanel, 1872, p. 108

A Cartesian diver is an experiment used to demonstrate the relationship between density and buoyancy.

Density describes how much matter is in a certain volume. Imagine filling two measuring cups, one with vegetable oil and the other with water. Now imagine placing those cups on a kitchen scale. You would find that one cup of vegetable oil has a mass of 223 grams and one cup of water has a mass of 240 grams. Vegetable oil has less matter in one cup than water, so vegetable oil is less dense than water.

Buoyancy is the ability of an object to float in water. If you poured the vegetable oil and water into the same container, the vegetable oil would be buoyant and float on the water.

You can change the density and buoyancy of a Cartesian diver at will, making it float or sink (hence Cartesian “diver”).

Cartesian divers are thought to be named for René Descartes. You may know them by another name, such as Cartesian devils, water devils, water dancers, or bottle imps. A Cartesian diver is made up of several parts: a bottle or vessel filled with water, a lid or an air-tight membrane, and a “diver” (often a piece of a straw or a flameworked glass object).

How does it work?

gif of glass cartesian diver in use

On the table in front of you sits a Cartesian diver. The diver is floating because it is less dense than the water. If you apply pressure to the vessel, the gas within the diver is compressed, and the diver’s density increases to the point that is no longer able to float in the water. Thus, the diver lives up to its name and sinks to the bottom. However, if you release the pressure, the gas expands to its original volume and the Cartesian diver becomes a Cartesian floater!

How did itinerant glassworkers use Cartesian divers?

Today, you might make a Cartesian diver in science class, but for hundreds of years they were made and used by itinerant glassworkers. These artisans made all sorts of models and contraptions to entertain their audiences, including Cartesian divers.

handbill with text and two images of glassworkers blowing glass and using a cartesian diver

Dieser Hollaendische porcellain-glass-blaser, 1670? Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 112252.

One of the earliest known records of these glassworkers is an advertisement for a demonstration in Poland circa 1670. On the right-hand side of the handbill, a Dutch glassworker is using a Cartesian diver with three figures, or “divers,” inside. Based on the description below the image, the glassworker promoted the experiment as a magic trick rather than a science experiment. He claimed he could command each figure to move up or down in four different languages and the figure would obey.

Cartesian divers remained a popular part of itinerant glassworkers’ shows, whether billed as magic or science. During the 1800s, many middle-class Americans wanted to be educated while they were entertained, and went to scientific demonstrations, lectures, and museum exhibitions in droves. Glassworkers accordingly included a growing number of experiments and lectures in their shows, and Cartesian divers were often shown alongside pulse glass circulators, philosopher’s hammers, cryophorus deception glasses, and hydro-pneumatic fountains.

a black and white photo with a man in a white coat and beret seated and flameworking at a table. on the table are a cartesian diver, a glass steam engine, and several other small models

John T. Backman Flameworking Glass Ship, McCroskey Studio, 1930s. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 152150.

Itinerant glassworkers continued to perform into the 1900s, but the advent of mass entertainment drew audiences away from itinerant performers of all types. Glassworkers looked for alternative options, like starting their own stationary tourist attractions or joining a circus as a side show. Cartesian divers remained popular elements of their demonstrations.

How do you make a Cartesian diver?

gif demonstrating how a diy cartesian diver worksYou can make your own Cartesian diver with things you probably already have around the house and these step-by-step instructions.

This post was co-written by Kathryn Wieczorek; both Cartesian diver gifs are provided by her. A version of this post was originally published on the Corning Museum of Glass blog on April 4, 2017.

What is an itinerant glassworker?

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An itinerant glassworker was a lampworker (or flameworker) who traveled from town to town performing for audiences, much like a member of a circus or a traveling theater troupe.

For more than 300 years, itinerant glassworkers entertained and educated crowds on the art, science, and skill of glassmaking, and the dizzying array of wonders that could be made of glass. These artisans contributed to a tradition that lives on today in flameworking demonstrations at museums, studios, and other attractions.

Itinerant glassworkers, likely Mrs. and Mr. F.A. Owen, stand behind a table covered in lampworked glass.

Glass Exhibition Featuring Spinning Wheel and Glass Steam Engine, 1904. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 131372.

Shows

A typical itinerant glassworker show included three main elements:

  1. Demonstrations of lampworking techniques such as glassblowing, spinning, and working.
  2. Showpieces such as elaborate glass models and scientific experiments.
  3. Displays of glass objects that audiences could purchase or were given with the price of admission.

Additional entertainments included lectures, live music, dancing, and competitions for glass prizes.

Timeline

Here is a rough timeline of the history of itinerant glassworkers:

1670s-1800s: Earliest known performers

handbill with text and two images of itinerant glassworkers blowing glass and using a cartesian diver

Dieser Hollaendische porcellain-glass-blaser, 1670? Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 112252.

As early as the 1670s, itinerant glassworkers performed in Europe. There are few records for this period; most are from the United Kingdom. These early artisans established the blueprint for itinerant glassworker shows going forward. They performed for royalty and tavern-goers alike, and positioned themselves as entertainment suitable for all audiences. Most demonstrated solo, and they typically offered practical items for sale alongside more fanciful objects. They did not list admission prices on their handbills or in newspaper advertisements, so it is unclear whether onlookers had to pay to watch their demonstrations.

1800s-1830s: Glassworkers demonstrate in Europe

handbill with text describing a glassworking demonstration. the handbill also has an illustration of an itinerant glassworker lampworking in front of a table covered in objects; he is surrounded by onlookers.

Scott’s Splendid Glass Working Exhibition in Miniature. United Kingdom: 1830. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 138463.

Based on surviving evidence, the number of itinerant performers and the popularity of their shows increased, especially in the United Kingdom. Glassworkers demonstrated in large towns like London, Glasgow, and Bath. They also traveled through the countryside visiting small towns and villages. Several first-hand accounts from audience members survive from this period, documenting the public’s fascination with the art of glass. These glassworkers created models based on famous landmarks and scenes that their audiences would have recognized. Some offered custom gifts such as the likeness of any dog in glass.

1810s-1850s: Glassworkers come to North America

handbill describing an itinerant glassworker show

Exhibition of Fancy Glass Working and Spinning United States Hotel, Private Entrance : Mr. Finn. Augusta, Georgia: 1840-1843. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 164968.

Eighteenth-century Americans, influenced by their Puritan backgrounds, often shunned traveling entertainers and educators of any sort, some going so far as to outlaw circuses, traveling menageries, and acting troupes. Once those restrictions were lifted, entertainers found success touring cities along the East Coast. The earliest known performance in the United States by an itinerant glassworker was in New York City in 1819. More European and American-born glassworkers followed, touring large cities like Washington, D.C., Boston, and New Orleans, as well as small villages and towns. Glassworkers continued to tour in Europe as well.

1840s-1890s: The rise of troupes and the glass steam engine

Illustration of a steam engine made of glass

The Great Double Working Glass Steam Engine Fairy Queen!, 1861. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 45696.

The Woodroffe brothers, three of the best-known glassworkers of this period, helped to establish new traditions in the trade with the formation of glassworking troupes and the popularization of glass steam engines. This was the heyday for itinerant glassworkers all over the world. Their shows were well-attended attractions in towns, at world’s fairs, in circuses, and in museums, and they traveled to places like South Africa, Indonesia, and Tasmania. This was also the time in which women-led troupes traveled in their highest numbers, including those of Madam Nora, Madam Anderson, and Madam J. Reith.

1900s-1930s: The advent of mass entertainment

a black and white photo with an itinerant glassworker in a white coat and beret seated and flameworking at a table. on the table are a cartesian diver, a glass steam engine, and several other small models

John T. Backman Flameworking Glass Ship, McCroskey Studio, 1930s. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 152150.

With the increased availability of entertainment technology such as phonographs, radio, movies, and later, television, as well as faster and cheaper transportation, potential audiences had more options for how to spend their leisure time. Because of this, itinerant performers of all types were forced to adapt. Many still went on tour, but others began to rely more heavily on appearances alongside other attractions. Some formed troupes with other types of entertainers or created dime museums. This was the beginning of the end for those lampworkers who could survive by leading a truly itinerant lifestyle.

1940s-1970s: From performers to artists

nona and john deakin demonstrate lampworking in their shop in sarasota florida

Nona and John Deakin Flameworking, Robert H. Ford, August 26, 1946, Larry Williams Collection. Collection of the Rakow Research Library, The Corning Museum of Glass, CMGL 152152.

Most of the remaining performers grew roots, and the itinerant lifestyle all but died out. Families of flameworkers opened shops or contracted with attractions like Disney World. Other glassworkers demonstrated at museums like the Corning Museum of Glass or stayed close to home. With the advent of the Studio glass movement, many flameworkers distanced themselves from the itinerant tradition. They began to establish themselves as members of the fine arts/crafts world and didn’t want to be associated with glassworkers who demonstrated flameworking at state fairs and shopping malls, making what they saw as kitsch or low-quality glasswork.

1950s-today: New performers

jen kuhn flameworker demonstrating at the corning museum of glass

Jen Kuhn demonstrates flameworking at the Corning Museum of Glass. Collection of The Corning Museum of Glass.

The tradition of glass demonstrations continues in museums, at studios, and with mobile hotshop programs like GlassLab and GlassBarge (both projects of the Corning Museum of Glass). Flameworkers are eager to learn more about the history of their craft, and a new generation of flameworkers are inspired by their itinerant predecessors. Some create models inspired by glass steam engines, while others find innovative ways to make flameworking more mobile. Still others recognize the value of this part of lampworking history and document it through articles, exhibitions, book chapters, and websites. A new awareness of itinerant glassworkers and their legacy is emerging.

Learn more about itinerant glassworkers, their shows, and the world around them on this site. Keep up with new posts by subscribing to my monthly newsletter.

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