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Principle of Underwater Sound
The purpose of the third edition, like that of the second, is to present new ideas, facts and concepts that have emerged in recent years. At the same time some older and userful material has been added as deemed appropriate by the use of the book in course teaching. The question of metric units has been given much consideration. Although scientists and engineers today use metric units universalaly, operations analysts and the users of sonar equipments do not, preferring to cling to the yard instead of the meter as the unit of distance-not because of the natural human reluctance to change, but because the range scales and manuals of existing equipments are calibrated in yards and nautical miles.
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