mounted in a frame optical difficulties of the problem it is impossible that the was apt to penetrate at the surface of the bare mica, spoil- ing the effect. focusing can be more than approximate. Now, matters provided with a mouthpiece, B. The vibration of the mov- Fig. 4 is a diagram which simply… … the disk, and vary, therefore, with every vibration phone little need be said. One device, which in Fig. 2.-THE0RETICAL DIAGRAM OF THE ARTICULATING PHOTOPHONE. with the utmost fidelity. The receiver of the arti- Prof. Bell's hands worked very successfully over a culating photophone is shown on the…
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