Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Sight Compass - click to enlarge

Sight Compass - click to enlarge

Click photos to enlarge.

Sight Compass

Catalogue number:
PH*333759

Inscriptions:
"KEUFFEL & ESSER CO NEW-YORK"

Dimensions:
4 inches diameter

Discussion:

This compass has one folding sight; a slit in the lid serves as the second sight. Since the lid is mirrored, the user can read the needle while sighting a distant object. The floating card is graduated to degrees and numbered every ten degrees to 360. There is also a second (inner) row of numbers in quadrants, reversed for reading in the mirror. This compass probably dates from the period 1890-1910. Keuffel & Esser donated it to the Smithsonian in 1972.

Ref: Keuffel & Esser, Catalogue (New York, 1906), p.427.

Further Information:

Keuffel & Esser
Compass (pocket)

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