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210 AMATEUR TALKING PICTURES
a magnetic pull, which does not actually operate the mechanism but winds up a spring.
At the demonstration we attended we saw some very interesting films, and must say that the quality of reproduction was excellent. Synchronism was, of course, perfect.
Another interesting feature of the projector is that there is no start mark to the film. One merely tucks the end in the top of the film gate, and pushes it down until one picture projects at the bottom. Next one goes to the gramophone and after making sure that it is wound sufficiently places on it a record pulling round until the arrow on the Synchro Disc coincides with another on the record. This having been done the needle of the sound box is placed upon the start mark in the ordinary manner. Finally, after releasing the brake of the gramophone one touches the switch seen near the pivot of the synchro arm, which sets the projector in action at the same time illuminating the 100 watt projector lamp. When the subject is finished one naturally removes the record, and at the same time cuts off the projector by a touch of this most conveniently placed switch.
It may be objected to this system that the length of subjects is of necessity limited owing to use of 78 or 80 r.p.m. discs. This is perfectly true but, gramophone records of the 10 and 12 in. variety have sold almost by the billion, and amateurs have found the amount of music or vocal matter contained thereon sufficiently long for entertainment. If the record by itself was long enough for home entertainment, then it must still remain satisfactory when illustrated by a picture. Although 78 or 80 r.p.m. is adopted as the tentative standard, there is no reason whatsoever why the equipment in the same form cannot be employed for 33 J records, although the obvious objection is that few people have turntables which rotate at this speed. This may form an opening for the use of the speed reduction turntable illustrated in Fig. 33. By using a device of this nature it is possible to convert the ordinary 78 r.p.m. turntable into one of 33 J. One can thus use 33J records with ordinary gramophones, and naturally with the above described sound-on-disc system.