. A practical treatise on medical diagnosis for students and physicians . Cammanns double stethoscope and Snellings rubber bell. place himself in an unconstrained position and see that his head is accom-modated to the position of the instrument, not the latter to the head. Ifthe parts over which auscultation is practised are covered with hair, anextraneous sound from friction is produced. This may be obviated bythe application of oil. The double or binaural stethoscojje has two ear-pieces. It is the mostsuitable for class instruction. It can even be applied over parts that are Fig. Listen
. A practical treatise on medical diagnosis for students and physicians . Cammanns double stethoscope and Snellings rubber bell. place himself in an unconstrained position and see that his head is accom-modated to the position of the instrument, not the latter to the head. Ifthe parts over which auscultation is practised are covered with hair, anextraneous sound from friction is produced. This may be obviated bythe application of oil. The double or binaural stethoscojje has two ear-pieces. It is the mostsuitable for class instruction. It can even be applied over parts that are Fig. Listenins; to the heart-sounds. quite tender. The rule of application to the chest is the same as for stethoscope. The ear-pieces should fit comfortably. The hummingsound in the tube is confusing at first. The diferential double sfethmcope has two bells, the sound from eachbeing conveyed to a different ear. THE PHONENDOSCOPE. 391 Tlie phonendoscope oxnisists of a flat circular metal box enclosing anair-^pace Avhich comnmnicates by means of tubes Avith the ears of theobserver. The bottom of the box is formed by a hard-rubber diaphragmcapable of vibrating easily. A stouter disk, to which a solid metallic Fig. 97. Fig. 98.
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