Abstract
Abstract A method of making nondestructive thickness measurements from one side on steel, especially in tank ships, using an ultrasonic gauge,, is described. Accuracy of the “slide rule” method of calibration is detailed, and the various sources of error examined and means of compensating for them explained. Merits of the cathode ray tube resonance instrument are explained and its efficiences over earlier instruments outlined. New techniques developed during experience in recent years are described and some changes in attitude toward earlier accepted procedures explained. Manner in which data are recorded is shown in tables. 2.4.3
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