...vibration occurred in the case of a large metallic mass. An intermittent beam of sunlight was focusBed upon a brass weight (1 kilogram,) and the surface...was necessary in order to obtain audible effects. Now, I do not mean to deny that sound waves may be originated in the manner suggested by Mr. Preece,...

...intermittent beam of sunlight, a clear musical tone was perceived by applying the ear to the hearing-tube (C.) The surface of the •diaphragm was then explored...was necessary in order to obtain audible effects. Now, I do not mean to deny that sound waves may be originated in the manner suggested by Mr. Preece,...

...Mr. Prcece may, therefore, be reconciled with the positive results obtained in America by Mr. Taiuter and myself. A still more curious demonstration of...was necessary in order to obtain audible effects. Now, I do not mean to deny that sound waves may be originated in the manner suggested by Mr. Preece,...

...case of a large metallic mass. An intermittent beam of sunlight was focussed upon a brass weight (I kilogram.) and the surface of the weight was then...was necessary in order to obtain audible effects. Now I do not mean to deny that sound-waves may be originated in the manner suggested by Mr. Preece,...

...large metallic mass. An intermittent beam of sunlight was focussed upon a brass weight (i kilogramme), and the surface of the weight was then explored with...was necessary in order to obtain audible effects. Now, I do not mean to deny that sound-waves may be originated in the manner suggested by Mr. Preece,...

...mass. An intermittent beam of sunlight was focussed upon a brass weight (I kilogram.) and the -.urhce of the weight was then explored with the microphone...the point of the microphone and the surface explored w as necessary in order to obtain audible effects. Now I do not mean to deny that sound-waves may be...

...B, diaphragm; C, hearing tube; WHS then explored with D. perforated handle. Figure reduced oue-half. the microphone shown in fig. 2. A feeble but distinct...sound was heard upon touching the surface within the illuniinated area and for a short distance outside, but not in other parts. In this experiment, as...

...illuminated area, and in the corresponding area on the other side of the diaphragm. Outside of this arsa on both sides of the diaphragm the sounds became weaker...was necessary in order to obtain audible effects. Now, I do not mean to deny that sound waves may be originated in the manner suggested by Mr. Preece,...

...case of a large metallic mass. An intermittent beam of sunlight was focussed upon a brass weight (i kilogram.) and the surface of the weight was then...was necessary in order to obtain audible effects. Now I do not mean to deny that sound-waves may be originated in the manner suggested by Mr. Preece,...