Fig. 1Ilenry's Pupilometer Used to Determine Fig. 2Testing the Hearing with the Fig. 3Henry's 0Ifactometer for Measuring the Direct Effect of Light on the Iris. Audiometer. Acuteness of Smell. Fig. 7Applying Alternating Currents In Fig. 6Henry's Apparatus for the Study of Fig. 4An Experiment in Thermal duced by Musical Vibrations to the Body. Mental Vision. Sensation., scientific american, 1908-07-04
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