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References

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  1. Published by permission of Director, Bureau of Standards. This instrument was designed and constructed by the Bureau of Standards, at the request of the Topographic Branch, U. S. Geological Survey, Department of the Interior.

Other (1)

Published by permission of Director, Bureau of Standards. This instrument was designed and constructed by the Bureau of Standards, at the request of the Topographic Branch, U. S. Geological Survey, Department of the Interior.

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Figures (4)

Fig. 1
Fig. 1

Fundamental range finding triangle

Fig. 2
Fig. 2

Method of adjustment

Fig. 3
Fig. 3

Instrument mounted on stadia rod

Fig. 4
Fig. 4

The pair of instruments