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248 RICHARDSON'S BLUEBOOK OF PROJECTION
illumination of the screen. This condition can be sometimes overcome by using an expensive wide-diameter lens.
Sacrifice Seats
(7) In some cases side and front seats may have to be sacrificed to avoid a very steep projection angle. The use of a too-long or too-short EF projection lens may also be avoided by the elimination of a few objectionable seats. The better screen image obtained by the correct location of the projection room is one of the important factors that keeps patrons continuously satisfied. Nothing is so ruinous to the success of a theatre as distorted or badly illuminated projection.
Construction Details
(8) Too little attention given to the proper fireproofing of projection room walls, doors or ports during construction often means unnecessarily high insurance rates. (9) Careful planning to meet all local and national fire regulations means a great saving in insurance rates,
Sound and Fireproofing
These two items are so closely connected that they may be considered under one heading. (10) The old projection room wall of steel, asbestos board, metal lath and plaster gave a measure of fireproofing, but failed altogether to meet the requirements of soundproofing.
(11) One modern practice is to construct walls of double-channel studs, fixing a substantial metal lath on each side and coating them with an approved cement plaster not less than three-quarters of an inch thick. This form of construction (provided a high grade Portland cement is used) forms two solid walls, between which is dead air space and plenty of room for conduit. Metal brackets to receive any desired shelving or benches may be attached to the studing before the plaster is applied. When this type of wall is employed, the outer plaster surface is heavily coated with a good