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196 HANDBOOK OF PROJECTION FOR
the machine warms up, and this, many times repeated, is more than likely to do harm. It may, in time, entirely ruin the armature and field coils, which would compel the rebuilding of the entire electrical part of the machine. Another serious objection to this location is that in case anything goes wrong it takes a very much longer time to investigate and make necessary adjustments or repairs than would be necessary were the machine located either in the projection room, or in a room adjoining and connecting therewith. Then, too, a dark basement (or other location) compels the making of all repairs and performing other necessary operations entirely by artificial light, which is to some extent objectionable. Another very, very serious objection with many basements is that when the furnace is going there Will be more or less coal and ash dust in the air, which is bound to get into the machine, and in course of time do irreparable injury thereto.
But after all, the most serious objection of all is the fact that the machine will be more or less inaccessible to the projectionist and wTill therefore be neglected. It most emphatically w7ill not receive the daily attention it ought to receive. Common sense should tell anyone that a machine which is conveniently located and easily accessible will receive more and better attention than if it be located at a distance and a more or less inaccessible place. Common sense should also tell anyone that lack of necessary attention means increased deterioration in the machine itself. In other words the machine which has proper attention will operate with greater efficiency and last much longer than one which does not receive proper attention.
The only legitimate objection to locating machines of this kind in or adjoining the projection room lies in the possibility of vibration and noise, or in the weakness of the Aoof. We may, however, dispose of the latter by saying that any floor too weak to carry a machine of this kind is entirely unfit to be the floor of a projection room. As to the matter of vibration, it has, to all intents and purposes, been eliminated in modern machines of this type and such vibrations as remains can be entirely absorbed by means of a felt, cork or rubber mat, as per instructions under "Installation."
GENERAL INSTRUCTIONS NO. 2— INSTALLATION.—
Upon receipt of a new motor generator the name plate should be carefully inspected. If it be a D. C. to D. C. machine it is only necessary to make sure that the voltage marked