Using Eimbeck duplex base-line measurement apparatus. Aligning duplex bar horizontally and vertically. Fig. No. 6, Appendix No. 3, Report of Superintendent ... 1901, p. 244.
Image ID: theb1147, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1901 Category: Geodesy/Base Line/ • High Resolution Photo Available
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