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Coast-Geodetic-Survey
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Historic Geodesy
Tide indicator mechanism of the tide indicator at the Maritime Exchange atPhiladelphia.
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Tide indicator display indicating rising water level.
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(2.18 MB)
Tide indicator display indicating slack water.
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(2.36 MB)
Tide indicator at Fort Hamilton. The pointer moves around the dial indicatingthe height of tides referred to mean low water. The arrow points upward whenthe tide is rising and downward when the tide is falling. The indicator isshowing slack water
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Reedy Island, Delaware River, pier and tidal indicator by moonlight. Theindicator tells the mariner that the tide is falling.
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(2.39 MB)
Reedy Island, Delaware River, pier and tidal indicator. Theindicator tells the mariner that the tide is falling.
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Back side of the Reedy Island tide indicator.
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(1.45 MB)
Constructing the tide indicator at Alcatraz Island.
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(1.66 MB)
Scaffolding for painting numerals and unit indicators on tide indicator. Righthand: Clear numerals on tide indicator after painting. Tide indicator points up, showing a rising tide.
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Woman professional operating the USC&GS; tide prediction machine duringWorld War II.
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The USC&GS; tide prediction machine No. 2, enclosed in wood casing. Thiscomputing machine is still fondly referred to as Old Brass Brains.
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Changing constituent elements for computing tides for a different location onUSC&GS; tide prediction machine No. 2.
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Mr. Disney of the Tides and Currents Division instructing trainee from thePhilippine Coast and Geodetic Survey on the operation of tide-predictionmachine no. 2, Old Brass Brains.
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(3.5 MB)
Recording tide predictions from the dials of the U.S. Coast and Geodetic Surveytide-predicting machine. The operator is Burt W. Wilcox.
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Front indicator panel showing traced tide curve and various dials related topredicting tide with Tide Prediction machine No. 2, Old Brass Brains.
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(3.11 MB)
Adjusting various constituent gears for predicting tide at a specific locationon the surface of the earth. Tide-prediction machine No. 2, Old Brass Brains.
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(3.15 MB)
Adjusting various constituent gears for predicting tide at a specific locationon the surface of the earth. Tide-prediction machine No. 2, Old Brass Brains.
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(3.18 MB)
The interior of the Coast and Geodetic Survey tide-prediction machine designedand built by Dr. Rollin Harris and Chief Instrument Maker Ernst G. Fisher.
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(2.8 MB)
Coast Survey employee Susan Tully using new automated tabulatingmachine for recording tides predicted on Tide Prediction Machine No. 2, theFisher-Harris machine. With the advent of electronic computers in the 1960's,this venerable machine became obs
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(2.75 MB)
View of back side of tide-prediction machine No. 1, the Ferrel tide-predictionmachine.
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