Smithsonian - National Museum of American History, Behring Center

 
Physical Sciences Collection - Surveying and Geodesy

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Theodolite - click to enlarge

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Theodolite

Catalogue number:
2000.0257.10

Inscriptions:
"WILD HEERBRUGG SWITZERLAND RDS-171658"

Dimensions:
height 11 inches; telescope 1.5 inches aperture

Discussion:
The Wild RDS is a normal direct-reading theodolite, similar to the Wild T16. Here, however, a diagram of reduction curves is projected into the field of view, enabling the surveyor to directly read the horizontal distance and height distance as intercepts of a graduated vertical rod. This instrument, which was probably made in the mid-1970s, has its original air tight and water tight steel case. The United States National Imagery and Mapping Agency transferred it to the Smithsonian in 2000.

Ref: Wild, RDS Auto-Reducing Tacheometer for Vertical Staff (Heerbrugg,n.d.).

Wild, Horizontal Distance and Difference in Height at a Glance. Wild RDS Self-Reducing Tacheometer (Heerbrugg, 1973).

Further Information:

Theodolite
Wild

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