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
of the U.S. Department of Commerce, National Oceanic & Atmospheric
NOAA Central Library
| NOAA Disclaimer
June 10, 2016