Cut-off, i.e. flashlight, in use at night on comparator.
Night-time operations in comparing lengths of steel tapes.
Fig. No. 13, Appendix No. 3, Report of Superintendent ... 1901, p. 258
Image ID: theb1136, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection
Photo Date: 1901
Category: Geodesy/Base Line/
• High Resolution Photo Available
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