Side scan sonar image

Side scan sonar image of vessel on seafloor.

Side scan sonar image of vessel on seafloor.

Side scan sonar image corrupted by thermocline.

Side scan sonar image

Side scan sonar image

Side scan sonar image distorted by thermocline. Dredge scours still show clearly through area.

Westinghouse sidescan sonar system towed by USC&GS SURVEYOR in summer of 1965 to aid in mapping effects of Good Friday Earthquake of 1964 in Prince William Sound area. This was possibly the first use of a towed sidescan sonar unit by a Coast and Geodetic Survey vessel.

Projection ruling machine of the U.S. Coast and Geodetic Survey. During the Second World War, the projection for literally thousands of maps was drawn by this machine which was much produced projections much quicker than human draftsmen.

Diagram of the projection ruling machine of the U.S. Coast and Geodetic Survey.

Magnetic observations along the Yukon River.

Magnetic observations at sea aboard the Coast and Geodetic Survey Steamer BACHE.

Survey party on the move. Probably Caspar Durgin's party somewhere in New Mexico on 104th Meridian survey.

Survey party encampment in the western desert.

JDA 1933 . Coast and Geodetic Survey truck 290 with Coast Surveyor somewhere in western desert area.

Surveying on the California coast. Topped tree used as signal and observing platform. Triangulation work.

Caspar Durgin's party somewhere in eastern Colorado or New Mexico. C&GS trucks No. 12 and No. 14. Surveying arc of 104th Meridian.

Bill - Doc - Tex - and ??? posed next to C&GS truck 290.

Clayton and party horse packing on the California coast.

Leveling party

Observing stand. U.S. Boundary Marker 100 on the U.S. Mexican Boundary. Dee and Elmer posing by the observing stand.

Studies of erosion and depostion on barrier islands and sandy beaches. In: Geographical Review, October 1931. P. 628.

First use of electronics for precise distance measurement. Carl Aslakson of the Coast and Geodetic Survey devised a method of airplane baseline crossing between two stations. The minimum sum of the two distances reduced to ground level was the true distance.

Shoran trilateration network using baseline crossing technique as noted on image cgs01187. This was the first extensive trilateration work using electronic techniques that was ever accomplished. Carl Aslakson of the Coast and Geodetic Survey was in charge of the technical aspects of the work.

Pulling Shoran Station equipment and supplies up Cape Wrangell Peak during the installation of the first electronic navigation which used Shoran. This station was at over 1700 elevation.

Shoran antenna on Cape Wrangell.

Living and electronics hut for Shoran station on Cape Wrangell.

Off-loading material and supplies for Shoran Station at Cape Wrangell.

The Coast and Geodetic Survey Ship WESTDAHL anchored in Tarr Inlet.

The Coast and Geodetic Survey Ship WESTDAHL in front of Taku Glacier.

Hydrographic survey launch conducting sounding operations in front of Taku Glacier. Note man in sounding barrel on starboard side. He is casting a leadline to measure the depth.

Arnold Karo described this as: "Symbolic of Hoonah Tribe. Killer whale carved in the rocks. Icy Straits, Alaska. Perhaps someone could validate that. The crew of the WESTDAHL made several designs for hydrographic signals the season of 1936 including snake, anchor, and squirrel. See next three images.

Three signals designed by crew of WESTDAHL during hydrographic survey operations in Icy Straits area.

Snake and moonshine signal designed and whitewashed by WESTDAHL crew. Used for three-point sextant fix to help position the survey craft.

Anchor signal designed and whitewashed by WESTDAHL crew. Used for three-point sextant fix to help position the survey craft.

Squirrel signal designed and whitewashed by WESTDAHL crew. Used for three-point sextant fix to help position the survey craft.

Coast and Geodetic Survey headquarters on New Jersey Avenue with Capitol Building on right.

Crew of the Coast and Geodetic Survey Ship WESTDAHL. Arnold Karo on the right.

The Coast and Geodetic Survey Ship WESTDAHL silhouetted between icebergs in Bartlett Cove.

The Coast and Geodetic Survey Ship WESTDAHL in front of Taku Glacier.

WESTDAHL in Glacier Bay.

WESTDAHL in Glacier Bay.

WESTDAHL crew members on iceberg in Muir Inlet.

WESTDAHL crew members on iceberg in Glacier Bay.

A temporary boundary marker between Canada and the United States

Tidal range at Anchorage. Low tide reading approximately 7.5 feet on the tide staff.

Tidal range at Anchorage. High tide reading approximately 41 feet on the tide staff.

First order leveling. Mechanized leveling with velocipede. Party of M. E. Lutz

Observer riding ahead. Level crew of W. H. Burger

Crew with motor velocipedes and inclined level. Party of J. D. Crichton