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I have devised a pleximeter that will overcome the difficulties and complexities of the present method of percussion by making it possible not to require more than the end of the finger to be used as the hammer proper, the balance of the finger acting with the hand and wrist. In order to do this the end of the finger must be properly weighted. The amount of weight should vary with one's proficiency in the use of the present method, the less experienced the greater the weight and vice versa. The pleximeter is preferably made of metal, thimble-shaped, with a gum tip which must be of an exact size for each pleximeter; the size and thickness of this tip should vary with the weight principally.
The gum tip serves two important purposes—it protects the finger struck, and it causes the finger to which it is attached to rebound more quickly,
LANGHORST WC. A THIMBLE PLEXIMETER.. JAMA. 1902;XXXIX(11):648. doi:10.1001/jama.1902.52480370041017a
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