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Description
Battery-powered electric signal lamp.Triangulation party of William M. Scaife (Image credit: Family of Captain William M. Scaife, C&GS;)
Credit
Family of Captain William M. Scaife, C&GS;
Display Date
1922
Location
Montana-Idaho
Collection
Historic Coast & Geodetic Survey
Geodesy
Triangulation
Heliotropes & Signal Lamps
Keywords
Geodesy
Triangulation
Lights
Electric