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Coast-Geodetic-Survey
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Historic Geodesy
Side view of tide-prediction machine No. 1, the Ferrel tide-prediction machine.
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(2.24 MB)
Current observation from deck of U.S.S. BACHE in Norfolk Harbor.
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(2.84 MB)
Shoal sand ridges on Georges Bank causing surface disturbance
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(4.18 MB)
Shoal sand ridges on Georges Bank causing surface disturbance
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(1.7 MB)
Chart of the Gulf Stream produced in 1854 from systematic Coast Surveyobservations beginning in 1845.
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(2.36 MB)
Woodcut of tidal bore on the Seine River at Caudebec. In: Flammarion, G. 1890?Popular Astronomy, English Translation. P. 170. D. Appleton and Company,New York.
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(4.12 MB)
Fishing at Dutch Harbor during an inport.
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(8.24 MB)
On the working grounds, a survey launch is dwarfed by the volcanic shores of theAleutian Islands.
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(7.59 MB)
Servicing a tide gauge
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(7.55 MB)
Horizontal control work in the Aleutian Islands
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(8.14 MB)
Observing angles with a theodolite on a chilly day in the Aleutian Islands.
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(7.35 MB)
Tending a tide gage.
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(7.63 MB)
Cartoon showing pigs running from the tidal bore in an arm of the Bay ofFundy. The pigs would run out when the tide receded and catch stranded fishand shellfish while one of their number would stay on a high point and warn ofthe approaching bore.
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(790.75 KB)
Leveling a Nation. Leveling operations at Point Loma Lighthouse, thesouthwestern corner of the contiguous United States.
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(2.48 MB)
Leveling crew working somewhere on West Coast. Party chief with hat on andstanding by instrument. Instrument mounted on railroad motorized speeder.Party chief is Lt. C. A. Egner.
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(3.73 MB)
Level crew using motorized speeders on railroad.
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(3.18 MB)
Configuration of speeder used in leveling operations along railroad.
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(2.62 MB)
Rodman maintaining rod in vertical position over mark while steam engineapproaches. Speeder crew moving speeder off track close to steam engine.
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(6.95 MB)
Maintenance area for speeders used in leveling operations.
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(3.37 MB)
Recorder sitting while working with tabulating machine; umbrella man shadingleveling instrument; and rodman holding rod vertical over turning point. Pictureshows how line sight clears recorder with inclined tripod. Party ofJ.D. Crichton.
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(7.1 MB)
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