Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Surveyor's Vernier Compass - click to enlarge

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Surveyor's Vernier Compass

Catalogue number:
PH*327880

Inscriptions:
"Edmund Draper 468 Philada"

Dimensions:
length 15.25 inches; needle 5.5 inches

Discussion:
This compass was made by Edmund Draper in Philadelphia, and dates from around 1876. It has a variation arc on the north arm that extends 28 degrees to either side; the vernier is moved by rack and pinion, and reads to 5 minutes. There are two spirit levels on the south arm.

Further Information:

Draper
Surveyor's Compass

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