Duplex bar No. 15 on its trestles. Figure No. 5, Appendix No. 11. Part II, Report of the Superintendent ... 1897, p. 483.
Image ID: theb1156, NOAA's Historic Coast & Geodetic Survey (C&GS) Collection Photo Date: 1897 Credit: NOAA Central Library Category: Geodesy/Base Line/Instruments/ • High Resolution Photo Available
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