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Physical Sciences Collection - Surveying and Geodesy

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Surveyor's Tape

Catalogue number:
1986.0395.14

Inscriptions:
"6285 TRADE LO-VAR MARK KEUFFEL & ESSER CO." and "NBS No 9228"

Dimensions:
length 50 meters

Discussion:
With a coefficient of expansion of about .0000015 per degree Centigrade, Keuffel & Esser's LO-VAR tapes were said to be more stable than ordinary steel tapes, which have a coefficient of expansion of .000016 per degree Centigrade. Keuffel & Esser also explained that, since LO-VAR tapes were intended for precise base line measurements, they generally carry only the end marks and one or two intermediate marks. This tape, however, is marked every 5 meters, and at 12.5 and 37.5 meters. It was tested by the National Bureau of Standards, and belonged to the United States Coast and Geodetic Survey. New, it cost $75.

Ref: Keuffel & Essser, Catalogue (New York, 1936), p. 535.

Further Information:

Tape
Keuffel & Esser

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