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MANAGERS AND PROJECTIONISTS 1079
the horns point too straight out, there may and probably will be a high sound volume in the center of the auditorium, with more or less fade-away at the sides. If they be made to point too much down, then sound in the balcony, if one there be, will not be sufficiently loud when it is correct in the lower floor, or vice versa.
In wide auditoriums the best purpose is served with the horns at the left of the screen (left as one faces the auditorium), pointing slightly to the right, and those on the right pointing slightly to the left, the amount bein^ determined by very carefully made experiments.
In theatres where, because of vaudeville or for other reasons, there must be a screen down front, whereas the regular screen is located at the rear of the stage and is permitted to remain in permanent position, with the horns behind it, if the front screen is only to be used for a short interval while the stage is being cleared after the vaudeville is finished, then it may be permissible to use the rear horns for the front screen, provided it be necessary to use sound during the interval. It usually is possible to use silent pictures during this short interval, however.
On the other hand, if the front screen is used to screen an entire feature before a vaudeville show starts, as is the case in some theatres, and a rear screen used to again screen it after the vaudeville is off, then it will be necessary to have two sets of horns, those serving the front screen to be flown. If horns are flown, then the ropes by means of which they are raised and lowered should have proper markers, which may take the form of knots in the ropes, so that each time the horns will be lowered to exactly the same height from the stage floor.
When horns are carried on horn towers mounted upon