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Coast-Geodetic-Survey
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Historic Geodesy
The fathogram trace of Pathfinder Seamount.
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.jpg
(3.27 MB)
A note from the great C&GS; bathymetrist Harold Murray stating that theseamount now known as Pathfinder Seamount was originally meant to be namedStudds Seamount, after the commanding officer of the PATHFINDER. Many yearslater a seamount was named fo
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.jpg
(1.21 MB)
A three-dimensional plaster (?) model of Gilbert and Patton Seamount groups inthe Gulf of Alaska.
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.jpg
(3.24 MB)
A note from Harold Murray of the Coast and Geodetic Survey describing themodel in image cgs00435.
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.jpg
(565.53 KB)
The axis of the Aleutian Trench as shown on the recording of an early deep water recording instrument.
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.jpg
(4.91 MB)
Note by Harold Murray describing deepest depth in the Aleutian Trench crossingshown in image cgs00437. The deepest depth was 3585 fathoms in this particularcrossing.
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.jpg
(1.52 MB)
Canyon crossing showing v-shaped canyon in the Aleutian Islands.
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.jpg
(2.09 MB)
Profile of continental slope west of Oregon. Note flat area on lower rightwhich is indicative of an abyssal plain.
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.jpg
(2.63 MB)
Note by Harold Murray concerning image cgs00440. Note greatest depth and thencompare to image cgs00442.
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.jpg
(1.39 MB)
Profile of continental slope off Oregon approximately 30 miles north of imagecgs00440. The extreme flat area offshore is exactly the same depth (1630 fathoms) as the similar flat area on image cgs00440.
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.jpg
(6.27 MB)
Note by Harold Murray describing what is seen in image cgs00442.
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.jpg
(804.75 KB)
Fathometer trace in the vicinity of the Juan de Fuca Ridge area showing manyminor knolls rising from the bottom. Subsequently, these features have beenshown to be of recent volcanic origin in close proximity to the Juan de FucaRidge spreading center
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.jpg
(2.66 MB)
Note by Harold Murray describing what is seen in image cgs00444.
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.jpg
(481.73 KB)
USC&GS; pressman (note logo on shirt) operating guillotine paper cutter prior tousing paper for printing charts.
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.jpg
(5.19 MB)
USC&GS; pressman (note logo on shirt) operating guillotine paper cutter prior tousing paper for printing charts.
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.jpg
(5.6 MB)
See image theb2933 for comparison.
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.jpg
(3.7 MB)
Operating the 50-inch camera designed by Captain Otis Reading, USC&GS.; After the compilation drawing is completed, glass plates negatives were made bythis precision camera, capable of photographing images up to 50 inches square.The error in reproduc
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.jpg
(3.65 MB)
Longitude and latitude lines are drawn on the Coast and Geodetic Surveyprojection ruling machine. This machine eliminated thousands of man-hours ofdrafting time that would have been required to produce the projections made forthe thousands of maps p
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.jpg
(3.91 MB)
The vacuum printing frame used to process wet plate negatives to aluminumprinting plates.
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.jpg
(3.19 MB)
Operating the 50-inch camera which was invented by Lieutenant Otis Readingduring the 1930's. This camera could photograph images up to 50 inches square.It would reproduce images with an error of less than one thousandth of an inch.
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.jpg
(3.75 MB)
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