Abstract
Since the advent of pure-tone audiometry it has been recognized that measurements of threshold by bone conduction may not be entirely dependable. Uniform standards have not been established for the calibration of bone oscillators, and therefore the results obtained in bone-conduction tests are purely relative. In 1931 Knudsen and Jones<sup>1</sup>felt that it would be desirable to express the results of bone-conduction tests in absolute units as was done in measurements by air conduction. They concluded, however, that the methods known to them did not permit such absolute measurement of hearing by bone conduction. Despite this difficulty, they considered the testing of bone conduction by electric apparatus to be significant and valuable. In 1936 a committee on methods of testing hearing by bone conduction outlined the difficulties of bone-conduction audiometry as compared with air-conduction testing.<sup>2</sup>The committee reported that there was no assurance that bone-conduction receivers would hold
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