Watch glass

Description (Brief)
This object is a watch glass made from Pyrex glass. A watch glass is a round, concave glass dish used for evaporation in chemistry. It can also be employed for weighing solids and as a lid for flasks and beakers.
Pyrex has its origins in the early 1910s, when American glass company Corning Glass Works began looking for new products to feature its borosilicate glass, Nonex. At the suggestion of Bessie Littleton, a Corning scientist’s wife, the company began investigating Nonex for bakeware. After removing lead from Nonex to make the glass safe for cooking, they named the new formula “Pyrex”—“Py” for the pie plate, the first Pyrex product. In 1916 Pyrex found another market in the laboratory. It quickly became a favorite brand in the scientific community for its strength against chemicals, thermal shock, and mechanical stress.
This object is part of a collection donated by Barbara Keppel, wife of C. Robert Keppel. Robert Keppel taught at the University of Nebraska-Omaha after receiving his B.S. in Chemistry from the University of California, Berkeley, and his Ph.D. in organic chemistry from M.I.T. The glassware in the Keppel collection covers the 19th and early 20th centuries.
Sources:
Dyer, Davis. The Generations of Corning: The Life and Times of a Global Corporation. Oxford, New York: Oxford University Press, 2001.
Jensen, William B. “The Origin of Pyrex.” Journal of Chemical Education 83, no. 5 (2006): 692. doi:10.1021/ed083p692.
Kraissl, F. “A History of the Chemical Apparatus Industry.” Journal of Chemical Education 10, no. 9 (1933): 519. doi:10.1021/ed010p519.
National Museum of American History Accession File #1985.0311
“University of Nebraska Omaha.” 2015. Accessed May 4. http://www.unomaha.edu/college-of-arts-and-sciences/chemistry/student-opportunities/scholarships.php.
Location
Currently not on view
Object Name
watch glass
date made
after 1916
maker
Corning Incorporated
Physical Description
pyrex (overall material)
Measurements
overall: .9 mm x 89 mm; 1/16 in x 3 1/2 in
ID Number
1985.0311.289
catalog number
1985.0311.289
accession number
1985.0311
subject
Science & Scientific Instruments
Science & Mathematics
Science Under Glass
See more items in
Medicine and Science: Chemistry
Science Under Glass
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Gift of Barbara A. Keppel

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