Duplex bars of Eimbeck base measuring instrument in contact.
Figure No. 4, Appendix No. 11.
Part II, Report of the Superintendent ... 1897, p. 483.
Image ID: theb1157, 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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