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As a teacher of otology, I have long experienced the difficulty of all teachers of this branch to properly train the medical student to perform the operation of paracentesis of the drum head, an operation which I think it is agreed that every general practitioner should be able to perform. I have solved this difficulty by a little device which I have put to use for several years in my classes at the College of Physicians and Surgeons of Baltimore. It consists of an addition to the well-known schematic ear model of Bacon (Fig. 1). This model is supplied with a large number of brass plates into which colored pictures of the normal and diseased drum-heads are placed for the purpose of "teaching manipulation of the speculum and head mirrors." I have had made double brass plates of a general form similar to those made to hold the pictures, but
FRIEDENWALD H. TEACHING THE STUDENT THE OPERATION OF PARACENTESIS OF THE DRUM-HEAD. JAMA. 1910;55(19):1643. doi:10.1001/jama.1910.04330190039010
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