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290 HANDBOOK OF PROJECTION FOR
the liquid, winding on the drum with the emulsion side out. '^ After the film is all on the drum, revolve it rapidly to throw ^off the surplus liquid, then continue to revolve the drum 'slowly until the film is dry. It should not be used for two 'or three days. Perform this operation in a room entirely ufree from dust, or you may seriously injure your film.
j Due to lack of proper exchange inspection it is usually ••necessary to inspect the films at the theatre before 'they are run. To do this place the reel on rewinder, and *rewind it very slowly, holding the edges between the thumb {and forefinger with pressure enough to cup it slightly. By ^so doing you instantly detect all stiff or loose patches. Cut £out the stiff ones and remake. Cement all loose patches and jnotch all split sprocket holes. If more than two sprocket iholes are missing on one side — that is, in succession, of ^course — cut the film and make a splice. Remember, my friend, Jan ounce of prevention is worth a pound of cure. Managers, | however, should not expect projectionists to inspect films for ^nothing. Such work is no part of his duty and should by all
• means be paid for, aside from the projectionist's regular ^salary.
•i EMULSION MAY BE REMOVED FROM FILM by soakjing the film in warm water, to which ordinary washing soda »has been added. Put in large double handful of soda to the T bucket of water. Wash the film afterward in clean, warm j water.
3 CLEANING FILM is a legitimate function of the film exJ change. Film gradually accumulates more or less dirt and •oil, all of which is highly injurious to the screen result.
• There are several cleaners on the market, designed for use win the projection room. They for the most part consist of an I arrangement for holding pads of canton flannel or other | material between which the film is pulled in the process of ^ rewinding. These devices remove considerable dust and ? dirt, and at least some of the oil, but have not proven very I popular, one reason being that there is always the possibility 1 of damaging the film badly by some foreign substance stickt* ing on the pads and scratching the emulsion in a straight | line all the way through the film.
Alcohol will remove dirt and will not injure the emulsion, but it is likely to cause the film to curl very badly, hence it is not to be recommended for the cleaning of film.
The Research Laboratories of the Eastman Kodak Company is authority for the assertion that film may be cleaned