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212 AMATEUR TALKING PICTURES
Mills Synchronizing Equipment. Normally a special type of camera is employed for taking these new system sound films, in which the speed of picture change is maintained constant while the number of pictures per second can be varied according to the nature of the subjects. Some subjects would naturally be projected at a speed slower than others. The system described above employs a detachable Synchro Disc which is actually a bakelite moulding easily detachable from the arm. The type of subject is to be indicated b}? the label colour of the disc. We understand and gather by demonstration that subjects such as singing, ordinary orchestration, can be photographed and projected at a much slower speed than others where more quicker movement takes place. In the equipment the only change necessary is to the Synchro Disc, which has to coincide in colour to the label of the record. Thus if we are using a red label record we must see that the Synchro Disc is also red. These discs are instantly detachable.
Although, as mentioned above, a special camera is normally used for taking these sound pictures, many ordinary cameras can easily be adapted for producing synchronized film . An interesting example examined by the writer was the relay attachment of a Bell & Howell 70 camera. The Synchro Arm and Disc were attached to the motor board of a gramophone in precisely the same manner as for projection, and the leads from the arm were connected via an ordinary high tension battery to an electrical relay which was attached to the camera.
First of all a record is made of the vocal side of the picture. This is then placed upon the gramophone turntable and the needle set to a predetermined start mark. With the camera focused on the subject and the battery connected, the turntable is started, and at the same time the switch on the Synchro Arm depressed. Synchronizing is then in process, the relay operating the trigger of the camera.
We examined a few films taken by this process and were astonished at their quality. It was pointed out to us, however, that since this was merely a "rig up," best results could not be expected. The real difficulty of the process lay in the fact that the shutter speed was too low, and that on