![]() The general principle of my device consists of sending high frequency vibrations into the part to be inspected, and the determination of the time intervals of arrival of the direct and reflected vibrations at one or more stations on the surface of the part.' For instance if a casting has a hole or a crack within it, my device allows the presence of the flaw to be detected and its position located, even though the flaw lies entirely within the casting and no portion of it extends out to the surface. 'My invention pertains to a device for detecting the presence of inhomogeneities of density or elasticity in materials. Extracts from the first two paragraphs of the patent for this entirely new nondestructive testing method succinctly describe the basics of such ultrasonic testing. 2,280,226, titled 'Flaw Detecting Device and Measuring Instrument'. ![]() invention patent for the first practical ultrasonic testing method. Floyd Firestone of the University of Michigan applies for a U.S. ![]()
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