Richardson's handbook of projection (1930)

1124 HANDBOOK OF PROJECTION FOR an unpleasant effect, and that should be the speed of action. Just use your own good judgment, avoiding sound distortion and bringing the sound volume up as quickly as you can without it. The proper method of handling the fader at changeover.— There is a right and a wrong way to do everything, including handling the fader, particularly at change-over. Just at that time several things are demanding attention at practically one and the same time, and unless you make it your habit to handle the fader in one certain way, you are likely to make an embarrassing mistake. The proper procedure is as follows : At the cue, start the projector motor, place your left hand on the douser and your right on the fader knob, making it your invariable habit to grasp the fader knob exactly as shown in Fig. 410. This latter is of the utmost importance. It is an insurance against inadvertently moving the fader knob the wrong way, as may and does sometimes happen when this practice is not followed. An error in this respect results in increasing the sound just at the time it should be decreased, on the projector you are closing down, and if you are making the change close to the end of the film, it, the film, may run out before you can get the fader over to the other side. This will of course cause a serious "balk" in the sound, besides an unpleasant roar of sound when you raise the volume instead of decreasing it. It is very bad in any event. However, if you form the habit of grasping the fader as shown at fade-over time, it will never occur, because, as you will see, it would be very difficult to turn the knob the wrong way when grasped as shown. The movement is in the direction of the arrows.