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274 MOTION PICTURE HANDBOOK
eyes on the screen every instant of the time. With the hand driven machine he is compelled to stay there, and that is the chief advantage urged for the hand drive. However, the driving of the projector by hand involves a very distinct hardship for the operator, particularly where there is only one employed. It means that for from three to eight hours, or even longer, he is compelled to turn a crank continuously, and this task is made none the easier by the knowledge that with a comparatively nominal first cost outlay and slight expense thereafter all this drudgery could be performed by a motor.
By the adoption of an ordinance requiring that the motor circuit be controlled by a switch held normally open by a spring (the Massachusetts law) and making the penalty for holding the switch closed by anything except the operator's hand punishable by revocation of the theatre license for two days for first offense and ten days for each subsequent offense, the operator may be effectively located at the projection machine, where he belongs.
There is another objection to the motor, that is, as a general proposition the speed of a motor driven projector can not or at least will not be regulated to suit the action in the picture as closely as it can and probably will be where a projector is hand driven. This, however, is not or at least would not be a serious objection if some scheme be devised to keep the operator at the machine, where he belongs, because with the more up to date motor driven projectors it is possible to change the speed quickly, and with a fair degree of accuracy.
There are a number of types of motor drives. Almost every machine has a speed regulating device of its own, and of course each manufacturer claims his to be the best. They are all excellent devices of their kind, and of course the particular one put out by each machine manufacturer is especially designed and adapted for use on the machine made by that manufacturer, and will probably give better satisfaction on those machines than will any other. The mechanical construction of these various drives are shown under the head of "Mechanisms."
In addition to this, however, there are a number of motor drives made by individual manufacturers for use on old style projectors or on the newer projectors which are not equipped with a regular motor drive. Two of these which are excellent, and can be recommended by the author, are the John D. Elbert Friction Speed Controller and the Freddy