Crashed helicopter on the beach at "Palm Springs" camp. Triangulation party of Walter Helm

Helicopter reconnaissance of station site at Anaktuvuk Pass. Triangulation party of Walter Helm

Observing with Wild T-3 on Arctic field party.

Training Liberians to conduct triangulation. Combined operations party of George Morris

Instructing Liberians in use of survey instruments. Combined operations party of George Morris

Instructing Liberians in geodetic operations. Combined operations party of George Morris

Twilight observations - note signal lamp on hill to right. Combined operations party of George Morris

Observing with Wild T-2 near Columbia Glacier.

Observing with Wild T-2 in Chinitna Bay. Party off of PATHFINDER

Observing in Chinitna Bay area at twilight. Party off of PATHFINDER

Setting up a Wild T-2 in the dunes.

Observing from the top of beachfront building.

Wild T-2 being used for positioning photogrammetry targets.

Recording angles for Station West Offset. Getting burned from sun and blistered from rock. Party off of WHITING

Wild T-2 observations from water standpipe.

Wild T-3 observations in Alligator Harbor. Supporting Launch 1257 operations

Wild T -2 observations. Note witness post

Wild T-2 observations at entrance to Chesapeake Bay

Recording Wild T-2 observations at entrance to Chesapeake Bay

Level instrument and Wild T-2

Oldest known sketch of Coast Survey sounding operations. Watercolor by James Madison Alden - 1857. Coast Survey Brig FAUNTLEROY in background

Alaska, 1898. Sketch by McFarland. Skiff hydro sounding operations

Hydrographic survey operations - note line from leadline extending ahead. Two observers shooting angles

Hydrographic Launch from 1942 Hydrographic Manual. EXPLORER Launch

Interior of hydrographic launch from 1942 Hydrographic Manual. EXPLORER Launch

36' hydrographic launch with 30' Shoran antenna. Launch off of PIONEER

Launch with Shoran antenna off Sledge Island. Launch off EXPLORER

Training Liberians to do hydrography

Shoran Launch No. 4 between Unga and Wosnesenski Island

Hydrographic launch off SURVEYOR near Kalgin Island, Cook Inlet

Interior of hydrographic survey launch off SURVEYOR

Coxswain Tosh Kaiura checking compass while getting on line. SURVEYOR launch at Pago Pago

Plastic Pig on line. WHITING launch in Pillsbury Sound

Jensen Launch on line. Launch off of PEIRCE

Jensen Launch on line. Launch off of PEIRCE

Jensen Launch on line. Launch off of PEIRCE

Jensen Launch on line dwarfed by nuclear power plant cooling tower. Launch off of PEIRCE

Skiff outfitted for hydrography - casting the lead. Skiff off of HYDROGRAPHER

Boston Whaler outfitted for hydrography. Boat off of PEIRCE

Small boat hydro - Cook Inlet area. Boat off of PATHFINDER

Low tide - rock shows where vessel struck and then sank. Vessel captain claimed to be in mid-channel far from any hazards. Paint, metal fragments, and rivets proved differently

Egyptian tomb painting from 1450 B.C. showing officer with sounding pole. Officer is telling crew to come ahead slow. Engineers with cat-o'-nine-tails assuring proper response from engines

St. Brendan striking out into the Atlantic - about 6th Century A.D. St. Brendan checking depths with his sounding pole

Frontispiece from the Hastings Rutter - 1450 A.D. early English pilot guide. Possibly first picture of leadline sounding

Sailor sounding from merchantman - Nineteenth Century. Sketch by Gordon Grant

Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms

Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms

Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms

Taking the reading when the line is vertical

Boatswain Jahnke casting the lead. Launch off the SURVEYOR