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In presenting to the profession the stethoscope shown here I wish to recommend it for its simplicity, lightness and durability. The bell is made from very hard metal, nickle-plated, and so thick that it shuts out all outside sounds. It, therefore, conveys the heart and lung sounds better and more clearly than any other instrument I have been able to find, and especially gives the heart sounds without the humming sound so noticeable in other stethoscopes.
WOODS EF. A NEW STETHOSCOPE.. JAMA. 1906;XLVII(17):1377. doi:10.1001/jama.1906.25210170041003a