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Coast-Geodetic-Survey
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Historic Geodesy
The negatives are then exposed to sensitized aluminum plates.
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The sheets are then reduced to the scale of the chart, proper selection of thematerial which will appear on it being made, and the whole worked into acompilation drawing.
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The soundings showing depths throughout the water areas are machine-cutthrough the film of the negative.
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After the plate is completed, a proof is made on the above press. The platesare made for offset printing and the proof is made by taking the print from theplate to a rubber blanket fastened on the cylinder. The rubber blanket deposits the print to
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Engraving on a nautical chart negatives.
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Engraving on nautical chart negative.
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Compiling a nautical chart from field survey sheets and other data.
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Preparing printing plates for presses.
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Compilation work for a nautical chart.
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Reproduction methods of the United States Coast and Geodetic Survey.
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Negative engraving tools.
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All the field data are sent to the Washington Office where the triangulation,magnetic, and tidal work is examined by mathematicians who make the necessaryadjustments to connect it with work already done. Cartographers complete theplotting, inking an
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Using a multi-plex stereoplotter to develop shoreline and topography from aerial photography.
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Army aerial photography unit with three-lens camera. Circa 1920's.
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Nine-lens camera used by the Coast and Geodetic Survey. It obtains topographyto be employed on nautical charts, and for making airport surveys. The cameratakes nine photographs simultaneously of adjoining areas on a single piece offilm 23 inches sq
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Nine-lens photograph. Reduction of a nine-lens camera photograph as taken withthe aerial camera of the C&GS.; The top photo represents the contact print fromthe negative, and the bottom photo represents the transposed view.
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Monument 272 along the Alaska-Canada Boundary in the Southeast Alaska area.
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Third-order triangulation station Iquak in southwest Alaska, while attached tothe USC&GS; Steamer DISCOVERER in 1923.
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Surveying party climbing over a glacier with Mount St. Elias in the background.Note dog with pack in foreground.
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Packing across a river in South Mindanao, Philippine Islands, enroute to atriangulation station.
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