Microscope

Description
This compound monocular was designed for use with the Brinell Ball Test for determining the hardness of a piece of metal. Here, a small ball is pressed into a sample, and the resulting indentation is examined with a Brinell microscope. Johan August Brinell, a Swedish engineer, proposed the test in 1900. The results are given in BHN (Brinell hardness numbers).
Ref: Bausch & Lomb, Microscopes, Microtomes and Accessories (Rochester, 1922), p. 100.
Location
Currently not on view
Object Name
microscope accessory
date made
early 20th century
Measurements
case: 2 1/8 in x 8 3/4 in x 2 1/2 in; 5.3975 cm x 22.225 cm x 6.35 cm
microscope: 7 in x 1 3/4 in; 17.78 cm x 4.445 cm
ID Number
MG*220982.01
catalog number
220982.01
accession number
220982
catalog number
M-09796
subject
Science & Scientific Instruments
Microscopes
Science & Mathematics
See more items in
Medicine and Science: Medicine
Microscopes
Data Source
National Museum of American History, Kenneth E. Behring Center
Credit Line
New Eyes for the Needy, Inc.

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.

Image CAPTCHA
Enter the characters shown in the image.