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FOR MANAGERS AND OPERATORS 633
50, according to the window space; dressing rooms, with two sides exposed, divide by 30 to 40, according to the window space.
As to the best apparatus, it would be an almost endless task to go into that. For the comparatively small theatre I think that when we consider cost of installation and efficiency the small cast iron boiler will best serve the purpose, but for a large auditorium the fire box boiler is, all things considered, probably best. The horizontal tubular boiler is a little more efficient, but it requires brick settings and more space.
In winter time it is possible to secure very good ventilation of a theatre by means of a double smoke flue for the boiler of the heating apparatus. To accomplish this the inner flue must be of metal and must be surrounded by a second flue of larger diameter, the air space between the two being connected, by a proper duct, to a point near the ceiling of the auditorium. The heat of the smoke flue will cause considerable suction in the air space, and this, of course, will draw out the foul air from the auditorium.
Lighting the Auditorium
IT is utterly impossible to deal with this subject except in generalties, because conditions in different houses vary so widely; also the ideas of theatre managers are at such variance on the subject of auditorium lighting that it is, I think, not advisable to attempt giving anything more than such general rules as will apply in all cases.
In the first place, it is absolutely essential to high class projection, or even to good projection, that no direct rays of light, other than those from the lens of the moving picture machine, be allowed to reach the screen. The first important step in auditorium lighting is to make sure that there is no light in the auditorium, except the picture light coming from the projector lens and the rays from the lighting system of the auditorium.
To test this matter, close all the doors and whatever is used to darken the windows, switch off all the auditorium lights, and see if any light enters from without — this, of course, applying to day time. If any daylight enters, take such steps as may be necessary to exclude it, and
Under no circumstances allow rays of sunlight to reach the screen.
Having finished this test, next open the entrance doors and the doors through which individuals in the audience