Excerpt from The Dental Record, 1893, Vol. 13: A Monthly Journal of Dental Science, Art, and Literature, Devoted to the Interest of the Profession
The first real step in the use of electricity is dentistry, with the exception of some plating and dipping processes in the workr... oom, was the invention, in 187 5, of the electric mallet, since brought to such high perfection by Dr. Bonwill, an American practitioner, who has shown himself to be possessed of very high mechanical ability. The action of this instrument is very simple. An electro magnet is placed in such a position as to act on a mallet of iron, which is kept apart from the coils by a small spiral Spring. When this mallet is acted upon by the passage of the electric current through the helix of the electro-magnet it taps the end Of the plugger, and at the same time breaking the contact of the circuit, it falls back released; and the blow is again repeated in a similar manner. The mallet is controlled by a small plate on the right side of the instrument, which, when pressed forward by the first finger of the Operator, completes the circuit, and thus causes the malleting to commence. A slot on the Opposite side of the vulcanite hand piece enables the manipulator to turn the plugger in any desired direction with the thumb.
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