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A test to determine compression strength, usually applied to materials of high compression but low tensile strength, in which the specimen is subjected to increasing compressive forces until failure occurs.



Related Terms

GREAT DIURNAL RANGE

The difference in height between mean higher high water and mean lower low water. Often shortened to DIURNAL RANGE. The difference in height between mean lower high water and mean higher low water is called SMALL DIURNAL RANGE.

LEAN MIXTURE

A fuel-air mixture containing a low percentage of fuel and a high percentage of air, as compared with a normal or rich mixture. Also known as lean fuel mixture.

NONHARMONIC CONSTANTS

Tidal constants such as lunitidal intervals, ranges, and inequalities which may be derived directly from high and low water observations without regard to the harmonic constituents of the tide. Also applicable to tidal currents.

LAGGING OF TIDE

The periodic retardation in the time of occurrence of high and low water due to changes in the relative positions of the moon and the sun.

REVERSING FALLS

Falls which flow alternately in opposite directions in a narrow channel in the St. John River, New Brunswick, Canada, due to the large range of tide and a constriction in the river. The direction of flow is upstream or downstream according to whether it is high or low water on the outside, the falls disappearing at the half- tide level.

DURATION OF RISE

Duration of rise is the interval from low water to high water, and duration of fall is the interval from high water to low water. Together they cover, on an average, a period of 12.4 2 hours for

REFRIGERATOR

A device to transfer heat from a low temperature to a high temperature medium.

GREAT TROPIC RANGE

The difference in height between tropic higher high water and tropic lower low water. Often shortened to TROPIC RANGE.

PHASE REDUCTION

Processing of observed high and low waters to obtain quantities depending upon the phase of the moon, such as the spring and neap ranges of tide. Formerly this process was known as SECOND REDUCTION. Also applicable to tidal currents.

TIDE PREDICTING MACHINE

A mechanical analog machine especially designed to handle the great quantity of constituent summations required in the harmonic method. William Ferrel’s Maxima and Minima Tide Predictor was the first such machine used in the United States. Summing only 19 constituents, but giving direct readings of the predicted times and heights of the high and low waters, the Ferrel machine was used for the predictions of 1885 through 1914. A second machine was used for the predictions of 1912 through 1965. Predictions are now prepared using a computer.

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