III. Study of Reinforcement of Sound by Means of the Schaefer Resonators

Minton John : Physical Characteristics of Normal and Abnormal Ears, Physical Review, pp. 80–96, February, 1922.

Minton John P. and Wilson Gordon J. : The Sensitivity of Normal and Defective Ears for Tones at Various Frequencies, Proc. Inst. of Med. of Chicago, pp. 157–171.

Rayleigh Lord : Theory of Sound, Vol. 1, pp. 85–86.

Rayleigh Lord : Theory of Sound, Vol. II, Chap. XVI.

Schaefer Earl L. : Ein kontinuierlicher Resonatosen Apparat, Beitrage zue Anatomie, Physiologie, Pathologie und Therapie des Ohres, der Hase, und des Holses, s. 132–151, Band III. Hept 1–2.

Sonnenschein Robt : Resonators, with Special Reference to the Schaefer Apparatus. The Laryngoscope, St. Louis, May, 1913.

Sonnenschein Robt : Resonators as Possible Aid in Tuning Fork Tests, A Preliminary Report.

Ryerson Physical Laboratory, University of Chicago.