engine revolution counter

engine revolution counter

[′en·jən rev·ə′lü·shən ‚kau̇nt·ər]
(naval architecture)
An instrument for registering the number of revolutions of a propeller shaft of a vessel; this information is useful in estimating a vessel's speed through the water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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