Some Observations on the Adaptation of the Double Beam Cathode-ray Oscilloscope to Biology and Medicine

Donovan G. E. (1943a) The Electrical Amplifying Stethoscope and Phono-electrocardioscope, J. Instn. elect. Engrs. (Wireless Section), June.

Donovan G. E. (1943 b) Phono-electrocardioscopy, Lancet (ii). (In Press.)

MacLeod A. G. Cohn A. E. (1941) A New Piezo-electric Manometer to Record Intracardiac Pressures and for the Simultaneous Recording of Intracardiac Electrograms, Amer. Heart J., 21, 345.