Duplex measures, making the final contact

Duplex measures, making the final contact. “Contact” meant bringing the two aligned bars together so the ends were touching . Fig. No. 7, Appendix No. 3, Report of Superintendent ... 1901, p. 244.

Photo Category: Geodesy - Base Line
Photo Date: 1901

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Author: NOAA

License: Public Domain Mark 1.0 (Public domain)

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Added On	18th October 2015
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