in glass, silvered on the filled only the alternate spaces between disks, the interme- transmitted by the seleniumcell-photophone is 213 meters, front, of about the size of the disk of an ordinary tele- diate spaces being occupied by mica disks of equal diame- or 233 yards. When sunlight is not… … when the mirror, B, is flat (that were heard without difficulty Fig. l.-THE MUSICAL PHOTOPHONE. and without doubt as to the means is, when not vibrating) the beam of transmission. The transmitter shown in Fig. 7 consists of a ter with the brass disks. But this arrangement was in no projected from…
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