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It may seem presumptuous to offer anything new in a field which has been so thoroughly tried as that of percussion, yet I offer what I believe to be a new method and one that possesses superior advantage over methods in common use.
Instead of a percussion hammer or finger with which to percuss the chest, I use a piece of rubber tubing, four or five inches long, and deliver the stroke directly on the surface of the chest. It makes a difference in the sound elicited whether a soft elastic tube or one with rigid walls is used; the former gives more or less of a dead sound, while the latter emits a note. The tubes which I have found most useful are a soft flexible tube with a lumen of 3/16 inch and walls 1/16 inch and a piece of ordinary tubing such as is used on douche
POTTENGER FM. RUBBER TUBING AS A PERCUSSION HAMMER.A NEW METHOD OF PERCUSSION.. JAMA. 1907;XLVIII(12):1027-1028. doi:10.1001/jama.1907.25220380043002a