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To the Editor:
—I am glad that Dr. Fossier has called attention to the error regarding the discovery of the polygraph. While the simple tambours were first employed by Vierordt in 1855, Marey first used the multiple tambour. Long before the time of Mackenzie, an instrument of this type was used by Hürthle. In 1898, when I first worked in Hürthle's laboratory, I attempted to obtain differences in the time relationship of the cardiac impulse and the carotid and radial pulses. This required the simultaneous working of three receiving and three recording tambours, the latter registering their excursions on the smoked paper of the kymograph above the second markings of a chronograph.Thus, the only difference between this early method of registration by means of multiple tambours and that of Mackenzie is that the various appliances were fastened to a small drum, which could be conveniently moved from place to
Burton-Opitz R. FIRST USE OF POLYGRAPH AND SPHYGMOGRAPH. JAMA. 1925;84(11):838. doi:10.1001/jama.1925.02660370047030
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