RT Journal
T1 NEw instruments.
JF Journal of the American Medical Association
JO Journal of the American Medical Association
YR 1899
FD December 23
VO XXXIII
IS 26
SP 1630
OP 1630
DO 10.1001/jama.1899.02450780062025
UL http://dx.doi.org/10.1001/jama.1899.02450780062025
AB A NEW CHEST-PIECE FOR THE STETHOSCOPE. 
    BY FREDERICK W. MERCER, M.D.CHICAGO.The chest-piece shown is so constructed as to be adjustable to any stethoscope having elastic conducting tubes. The plan is a modification of that adopted in the construction of a class of ear trumpets, and the object attained is increased volume and greater intensity of pitch than has been possible with the common or direct chest-piece.Intensity is not so noticeable when auscultating the heart, as it is in the respiratory murmurs, where this device takes the same rank as does the phonendoscope in heart sounds. To those having a dulled sense of hearing, this little adjunct will be found a welcome aid.German silver is the best material for its construction. The plan consists of an outer bell (A), slightly conical; an inner bell (B), also conical, but much smaller. The inner bell is in reversed position