Cartrax – Stethoscopic Heart Sounds

Suggestions for reproduction:

The unique feature of this record is that it was produced so that it might be listened to with a stethoscope. It is suggested that one sit comfortably in his chair, hold the chest piece of the stethoscope in his hand and with the ear pieces in place, start the record, close his eyes, and listen. The loudness is then adjusted so that the spoken voice is just heard distinctly; this results in a normal level of intensity for the sounds and murmurs of the illustrations. The advantages of using a stethoscope are obvious: the doctor is in a normal frame of mind for listening to a heart, extraneous room naises are eliminated, many high frequencies are ruled out and the sounds seem to be concentrated on the chest piece.

No matter how perfect a record may be, its reproduction is dependent upon the perfection of the reproducing unit (phonograph) and the acoustics of the room in which it is played. While you may listen. to this record without a stethoscope and with any degree of amplification, faithful reproduction is only assured by following the suggestions noted above.

Do not try to listen for too long a time.

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