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ing its effectiveness with the audience? And if this is true, does it not follow that the projection machine enclosure, including its contents and the men in charge, are of huge importance to the industry?
For the foregoing prelude I make no apology. If there is objection to space consumed, just consider the amount of space used up during past years on subjects of far less importance to the industry, and hold your peace.
To begin with, the writer very seriously objects to the name given the projection machine enclosure, namely, "booth." Webster, who is presumed to know what is correct in words and language, tells us a booth is a "temporary structure of boughs; a shack."
For many years I have used the name "operating room." This, however, while a very decided improvement over "booth," does not quite fill the bill. It seems to me that, logically, the room from which pictures are projected is a "projection room," and the writer respectfully suggests to this body its adoption by the department of nomenclature. It will be hereafter used in this article.
The only possible objection to the use of this name is the fact that some theatres and producers have applied it to the room where pictures are screened for examination. Such rooms are, however, properly either "exhibition" or "screening" rooms, and that a misnomer has been applied should not, I think, prevent applying the logically proper name to the room from which pictures are projected.
Structure: The projection room must have fireproof walls, floor and ceiling. The floor must be solid and free from vibration, as any vibration communicated to the projectors will inevitably affect the screen result. For the floor I would, therefore, suggest not less than four, and preferably six inches of the usual mixture for "rich" concrete, the stone to be not larger than will pass through a one-inch screen. Over this should be a one-inch top dressing, guaranteed not to disintegrate into dust. Many cement finish floors show this fault, and it is a very serious one, since the dust gets on the films and into the delicate machine parts, where, due to its nature, it acts as an abrasive and does great, though slow, damage. For this reason I would suggest that the top dressing might better be tile, similar to that commonly used for bath room floors. If cement is used, it should be treated to an acid bath to harden its surface. Such a bath is available, but its application would very nearly make the cost of the cement finish equal to that of tile, and tile is much to be preferred, from any and every viewpoint.
Note. — Since the foregoing was written I am informed there is a varnish which is giving satisfaction in generator and other rooms in which this fault has been experienced. This matter will be looked up and the name of the varnish announced through the usual channels later.
In wall and ceiling construction, there are the following points to be considered, viz: fireproofing, soundproofing, rigidity and lack of heat-absorbing and retaining qualities.
For permanent installations there is nothing that so well fills all these requirements as six-inch hollow tile, set in, and plastered on both sides with rich cement mortar. Such a construction is, by com
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