. A practical treatise on medical diagnosis for students and physicians . Allisons differential stethoscope. Phonendoscope: A, metallic rod. rod may be screwed, can be slipped over the inner rod disk. With thephonendoscope the intensity of the sounds is increased. In the multiple stethoscope or phonendoscope, for the use of classes,several sets of ear-pieces are attached to one chest-piece by means ofbranched tubing. Errors to be Avoided in Ausculting. In ausculting it is necessaryto disregard external noises, sounds produced by friction of the stetho-scope or towel upon the skin or of the fin
. A practical treatise on medical diagnosis for students and physicians . Allisons differential stethoscope. Phonendoscope: A, metallic rod. rod may be screwed, can be slipped over the inner rod disk. With thephonendoscope the intensity of the sounds is increased. In the multiple stethoscope or phonendoscope, for the use of classes,several sets of ear-pieces are attached to one chest-piece by means ofbranched tubing. Errors to be Avoided in Ausculting. In ausculting it is necessaryto disregard external noises, sounds produced by friction of the stetho-scope or towel upon the skin or of the fingers upon the stethoscope, thecreaking of a starched towel, noises produced in the stethoscope itself,and muscle-sounds. One must avoid tilting the bell, allowing the tubesto become blocked, kinked, or disconnected, or inserting the ear-piecesupside down. 392 METHODS OF PHYSICAL DIAGNOSIS. Graphic Records of Physical Signs. In order to draw accurate conclusions from the various data obtainedduring the physical examination of a patient the physician nmst carry inhis min
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