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![Battery-powered electric signal lamp theb1636.jpg Battery-powered electric signal lamp](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_theb1636.jpg?itok=43GcLdlL)
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