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HELIOTROPES & SIGNAL LAMPS
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Coast-Geodetic-Survey
Geodesy
Triangulation
Heliotropes & Signal Lamps
Geodesy
Heliograph at Station 22.Alaska - Canada border.International Boundary Commission
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Signaling with heliograph near Monument 92.Alaska - Canada border.International Boundary Commission
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Heliotrope being used in western United States
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Light reflecting from heliotrope.Triangulation party of William M. Scaife
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Battery-powered electric signal lamp.Triangulation party of William M. Scaife
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Heliotrope setup at camp of lightkeeper.Triangulation party of William M. Scaife
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Showing light at Station Northome.Battery powered lights about 110 feet above ground.Triangulation party of Carl Aslakson
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Signal lamps
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Signal lamp and batteries
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