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This diagnostic sound is unlike the regular sound, since a short distance from the blunt point is an hour-glass-like constriction or neck (Fig. 1). A similar constriction of the sound's diameter is located on the straight portion of the instrument. The strictures are easily felt by the operator as the hollows of the sound slip by them or hug the elevated points (Fig. 2). Physicians with an "educated" tactile sense very soon become familiar with the jerky feeling, and with this instrument can tell the precise condition of the caliber of the entire urethral canal. The sound is an ideal one in cases in which the lumen is small and very sensitive, inasmuch as its construction permits the use of instruments of very small caliber. They are made at present in sizes 18, 21 and 24, French.
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—There is not a solitary line of preventive
Maguire FJW. A DIAGNOSTIC URETHRAL SOUND. JAMA. 1915;LXV(21):1814. doi:10.1001/jama.1915.25810210002017c
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