Abbé Refractometer

Warren P. Valentine began making refractometers when World War I limited the import of European instruments into the United States. By 1920 the National Bureau of Standards reported that Valentine's Precision Refractometer was “the most accurate Abbé refractometer we have so far tested.”
In 1928, Valentine received the Edward Longstreth Medal of the Franklin Institute in “consideration of the meritorious work shown in the improvement of the mechanical and optical parts of the Abbé refractometer, thereby increasing its accuracy.”
This example is marked “VALENTINE REFRACTOMETER NO. 591 INDUSTRO-SCIENTIFIC CO. PHILADELPHIA.” The National Bureau of Standards transferred it to the Smithsonian in 1965.
Currently not on view
Object Name
Valentine, Warren P.
place made
United States: Pennsylvania, Philadelphia
ID Number
catalog number
accession number
National Bureau of Standards
Franklin Institute
World War I
Measuring & Mapping
See more items in
Medicine and Science: Physical Sciences
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
National Bureau of Standards

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.