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Girl Receives Letter
From Dept of Commence
In senior government class the discussion led te tides end Mr. link told of the tide-predicting machine which he had seen at the Coastal. Geodetic Survey. A letter was written te the Department of Commerce for more information.
The machine is used for predicting the times end heights of the tide for the tide tables published each year in advance by the Coastal Geodetic Survey. It was designed and cons ti-ucted in the instrument shops of the survey and pis the only machine of its kind in the United States. The tides are brought about by the attraction of sun and moon, hence the tide-producing forces are distribu ed over the earth in a regular pattern. The valves are set on the tide-pred;cting machine which takes account of 37 simple constituent tides and operation of the machine then shows automatically the times and heights of the successive high and low waters that will occur at the place during the year in question.
Advance information relative to the rise and. fall of the tide hat become an indispensible aid in a number of the problems ass 'Hated with maritime commerce of today. Doe to the tide the depth of water under the, keel of a ship is constantly changing anid^ for the safety of (both life and property the mariner must know the available depth at all times. Not alone to the mariner are tide predictors important, for. advance knowledge of the stage of the tide is becoming valuable to the fishing industry and to the engineer engaged' on projects of river and harbor improvement.
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