Stone marking end of comparator, a 100-meter very stable short base line

Stone marking end of comparator, a 100-meter very stable short base line. Comparator was used to calibrate and intercompare various measuring instruments . This comparator was at Shelton, Nebraska, near Station Shelton East Base. Fig. No. 2, Appendix No. 3, Report of Superintendent ... 1901, p. 244

Photo Category: Geodesy - Base Line
Photo Location: Nebraska, Shelton
Photo Date: 1901