The diplacusis described in this paper was my own case and presented an unusual opportunity for study. During an acute attack of purulent rhinitis of the ordinary "head cold" variety, bilateral eustachian catarrh, stuffiness in the ears, impaired hearing, a "sea-shell" tinnitus, transitory spells of dizziness and diplacusis developed. The dulness of hearing, diplacusis and tinnitus were
Fig. 1.—B 488 Koenig fork (which was interpreted as D 581 in the left ear by reason of false impression). The fork was struck a standard blow by a swing pleximeter, and was timed by a stop watch from the time struck. The normal for this fork is thirty seconds bone conduction, and fifty-five seconds air conduction. The dampening factor expressed in sensation units per second is 2.0, the factor K for reducing the loss of hearing to percentage is
MACFARLAN D. AN UNUSUAL TYPE OF DIPLACUSIS. Arch Otolaryngol. 1928;7(1):41–43. doi:10.1001/archotol.1928.00620010049004
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