This “Demonstration Ocular” is so designed that a teacher and a student can see the same microscopic object at the same time. The inscription reads “SPENCER / BUFFALO / U.S.A.” The inscriptions on the leatherette-covered wooden case read “Spencer / Buffalo, U.S.A.” and “Fisher / Scientific Co. / Pittsburgh, PA, U.S.A.” Spencer introduced this instrument in 1917. Fisher Scientific began in business, as such, in 1925.
This example came from Robert Leonard, a pharmacist and professor of pharmacology at George Washington University.
Ref: Spencer Lens Co., Catalog of Products (Buffalo, 1917), p. 112.
Currently not on view
Object Name
two-person microscope
date made
ca 1925
Spencer Lens Company
Physical Description
metal (overall material)
glass (overall material)
leatherette (overall material)
overall: 5 in x 6 31/32 in x 1 1/4 in; 12.7 cm x 17.69872 cm x 3.2004 cm
place made
United States: New York, Buffalo
ID Number
catalog number
accession number
Science & Scientific Instruments
See more items in
Medicine and Science: Biological Sciences
Science & Mathematics
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
Robert Leonard

Visitor Comments

Add a comment about this object

**Please read before submitting the form**

Have a comment or question about this object to share with the community? Please use the form below. Selected comments will appear on this page and may receive a museum response (but we can't promise). Please note that we generally cannot answer questions about the history, rarity, or value of your personal artifacts.

Have a question about anything else, or would you prefer a personal response? Please visit our FAQ or contact page.

Personal information will not be shared or result in unsolicited e-mail. See our privacy policy.

Enter the characters shown in the image.