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Coast-Geodetic-Survey
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Historic Geodesy
A triangulation party at the foot of Mt. Galintan in the Davao Gulf region ofMindanao, Philippine Islands. The party but a few minutes before had emergedfrom the woods in the background through which they had traveled by compassalone for a day and a
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Freighting in Texas with a barrel wagon.
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Packing a theodolite across the swollen Verde River, 1924.
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(1.27 MB)
Canadian and U.S. representatives of the Alaska-Canada International BoundarySurvey meet at Point Demarcation on the Beaufort Sea. The U.S. representativetook great pride in having attended Princeton University.
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Northernmost point on the Alaska-Canada Boundary, where the 141st Meridianprojects into the Beaufort Sea. The U.S. Coast and Geodetic Survey representedthe U.S. in the delineation of this boundary.
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The goat trail in Chitistone Valley used during the Alaska-Canada BoundarySurvey, 1913.
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Early C&GS; trucks passing through plowed field.
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A plane-table party working in Alaska. The use of aluminum-mountedtopographic survey sheets greatly facilitated plane table surveys in regionswhere fog and rain prevail, as they eliminate the difficulty due to distortionof ordinary paper sheets.
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The making of a plane-table survey in Philippine mangrove swamps. Thesewaters were frequented by salt-water crocodiles necessitating a constant lookout. This party was off the C&GS; Steamer FATHOMER during the field season of1915-1916.
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Shoreline topography in Alaska.
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Topographic work in Alaska, Glacier Bay area, off of C&GS; Ship WESTDAHL.
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Topographic work in Alaska, Glacier Bay area, off of C&GS; Ship WESTDAHL.
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A theodolite for observing horizontal angles.
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(1.88 MB)
Observing horizontal angles with a Wild T-3 theodolite from a lighthouse.
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(3.36 MB)
Triangulation tower constructed from pre-cut lumber at Tacoma North Base. Pre-Bilby Tower era.
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Building crew constructing a steel portable Bilby triangulation tower.
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Station Tensas. A 159-foot Bilby tower was constructed here in April, 1931.Lieutenant Ralph Pfau was chief of party at this station along the Atlanta-Shreveport triangulation arc.
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(1.15 MB)
Using collimator to align instrument observing stand at top of Bilby tower withmark in the ground at a triangulation station.
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A Bilby triangulation tower in the vicinity of an oil production facility.
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Light keeper orienting lights for triangulation observing party prior tobeginning night's observations. Apparently operating off a water tower.
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(2.23 MB)
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