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In the stethoscope here illustrated an attempt has been made to combine the desirable features of a number now in use. The advantages claimed are increased clearness and distinctness of sounds transmitted; its lightness and the ease by which the whole instrument can be made aseptic. In its construction only thin and hard German silver tubing should be used, the chest piece being of the same material. The bell, or chest piece, differs to a degree from existing forms in having the bifurcation carried down rather close to the rim and the bell itself made as short as possible. The mouth of the bell has a diameter of 25 mm. and each bifurcation has an internal diameter of 8 mm. The pure gum, antimony tubing connecting the chest piece with the ear tubes should have extra thick walls, with an internal diameter of 8 mm. The metal ear tubes made
MERCER FW. AN IMPROVED STETHOSCOPE.. JAMA. 1898;XXX(10):571. doi:10.1001/jama.1898.72440620040034