2050 | |
Skiff outfitted for hydrography - casting the lead. Skiff off of HYDROGRAPHER |
Eastern Gulf of Mexico 1925 |
2051 | |
Boston Whaler outfitted for hydrography. Boat off of PEIRCE |
Penobscot Bay, Maine 1985 |
2052 | |
Small boat hydro - Cook Inlet area. Boat off of PATHFINDER |
Lower Cook Inlet, Alaska 1970 |
2053 | |
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 |
Alaska |
2054 | |
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 |
Egypt 1450 B.C. |
2055 | |
St. Brendan striking out into the Atlantic - about 6th Century A.D. St. Brendan checking depths with his sounding pole |
Ireland 500 A.D. |
2056 | |
Frontispiece from the Hastings Rutter - 1450 A.D. early English pilot guide. Possibly first picture of leadline sounding |
Thames River, England 1450 A.D. |
2057 | |
Sailor sounding from merchantman - Nineteenth Century. Sketch by Gordon Grant |
|
2058 | |
Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms |
Gulf of Mexico 1917 |
2059 | |
Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms |
Gulf of Mexico 1917 |
2060 | |
Double sounding chair arrangement. Effort to double density of soundings. Working off of HYDROGRAPHER in 20 to 25 fathoms |
Gulf of Mexico 1917 |
2061 | |
Taking the reading when the line is vertical |
|
2062 | |
Boatswain Jahnke casting the lead. Launch off the SURVEYOR |
|
2063 | |
Casting the lead - Hydro Manual 1931 |
|
2064 | |
Casting the lead - Hydro Manual 1931 |
|
2065 | |
Leadline is vertical for reading. Working off the WESTDAHL |
Southeast Alaska 1936 |
2066 | |
Tossing the leadline. Working off the WESTDAHL. Note splash of lead out ahead of ship |
Southeast Alaska 1936 |
2067 | |
Sounding in Salton Sea for seaplane landing site. Part of war project to establish seaplane landing sites. Sites used for ferrying seaplanes across United States |
Salton Sea, California 1942 |
2068 | |
Trolley sounding arrangement. Off of ISIS |
Chesapeake Bay area 1915 |
2069 | |
Trolley and line ready for next sounding. Off of ISIS |
East Coast of the United States 1916 |
2070 | |
Trolley rig - Hauling slack from sounding line prior to sounding. Off of ISIS |
East Coast of the United States 1916 |
2071 | |
Trolley rig - paying out leadline by hand as trolley carriage runs down cable. Off of ISIS |
East Coast of the United States 1916 |
2072 | |
Getting upright cast as sounding stand passes position of lead. Off of ISIS |
East Coast of the United States 1916 |
2073 | |
Hauling in sounding line of trolley rig using hand crank on boat deck. Off of ISIS |
East Coast of the United States 1916 |
2074 | |
Arrangement of sounding machines on PATHFINDER. Off of PATHFINDER |
Philippines 1921 |
2075 | |
Arrangement of sounding machines on PATHFINDER. Off of PATHFINDER |
Philippines 1921 |
2076 | |
Arrangement of sounding machine on PIONEER. Off of PIONEER |
Southwestern Alaska Peninsula 1924 |
2077 | |
Coast and Geodetic Survey sounding tube equipment. Hydrographic Manual 1931, Figure 17, p. 53 |
1931 |
2078 | |
Shelter and equipment used in reading sounding tubes. Off of PIONEER |
Southwestern Alaska Peninsula 1924 |
2079 | |
Robert Williams with first Fessenden oscillator on the tug Susie D. First successful test of sonic system. Looking for icebergs but also found bottom |
North Atlantic 1914 |
2080 | |
Sonic sounding apparatus on the GUIDE. On the ship GUIDE |
|
2081 | |
Title page to manual - "The Submarine Fathometer". Fathometer invented by Herbert Grove Dorsey of the Sub Signal Corporation. |
|
2082 | |
Fathometer Filter. From the manual - "The Submarine Fathometer" |
|
2083 | |
Fathometer Oscillator. From the manual - "The Submarine Fathometer" |
|
2084 | |
Internal View of Fathometer. From the manual - "The Submarine Fathometer" |
|
2085 | |
Herbert Grove Dorsey - chief physicist of the Coast and Geodetic Survey. With Dorsey Fathometer - Dorsey came to work with C&GS in 1926 |
1930? |
2086 | |
Operator using Dorsey Fathometer with flashing light method. Merchant Marine Bulletin No. 9, May 1931 |
|
2087 | |
Leo Otis Colbert with Dorsey Fathometer No. 3. The first effective shallow and deep water echosounder. Operator watched flashing light. On the ship OCEANOGRAPHER |
East Coast of the United States |
2088 | |
808 fathometer transducer. Hydrographic Manual 1942. Called first portable sonic sounding device. First acoustic sounding device used on C&GS sounding boats for shallow water. First use of shallow water fathometer continuous records by C&GS |
|
2089 | |
Prototype "portable" depth recorder used as part of 808 fathometer system. Bulletin 13 of the Association of Field Engineers, 1939, p. 102 |
|
2090 | |
"Echometre" record from S. S. De Grasse. Crossing over canyon near Georges Bank. Bulletin 4 of the Association of Field Engineers, Dec. 1931, p. 83 |
|
2091 | |
Early graphic record from Sub Signal system. Off S.S. Yarmouth between Boston and Yarmouth. Bulletin 6 of the Association of Field Engineers, Dec. 1932, p. 60. |
|
2092 | |
Various bottom configurations plus bar check record. Hydrographic Manual 1942 |
|
2093 | |
Various bottom configurations. Hydrographic Manual 1942 |
|
2094 | |
Ship on Nantucket Shoals that was subsequently blown up. Fathometer record of remains of ship |
|
2095 | |
Expanded view of fathometer record of remains of ship |
|
2096 | |
Outer Nushagak Bay sand waves. Observed on PATHFINDER |
|
2097 | |
Hydrothermal spring discharging fluid off Pagan Island. Observed on NOAA Ship TOWNSEND CROMWELL |
Pagan Island, Marianas Islands 1980? |
2098 | |
Running up to bank and loosing trace - then heading back out into bay. Record from PEIRCE launch in Delaware Bay 1985 |
Delaware Bay 1985 |
2099 | |
Ragged appearing fathogram trace caused by coral heads. Record from PEIRCE launch off Eleuthera Island |
East side of Eleuthera Island, Bahamas Islands 1984 |