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198 MOTION PICTURE HANDBOOK
Acetone Cement. — Four ounces of acetone; one-half ounce ether; six inches old film, from which remove the emulsion and cut into strips.
Another Formula. — Equal parts of amyl acetate and acetone. Will not turn white on film, and will not dissolve the film as ether will. Works on all kinds of stock. Best used with an all steel three flap film mender. Can be used by those making patches by hand if worked rapidly. Scrape film, use small camel hair brush; keep bottle tightly corked when not in use.
Still Another. — One ounce collodion; one ounce banana oil or bronzing liquid; one-half ounce ether. For Pathe hand colored films, one-half acetone and one-half ether.
N. I. Cement. — For non-inflammable film add one part glacial acetic acid to four parts of flexible collodion or to any of the film cements. It is satisfactory for either N. I. or regular film.
Please understand that these are formulas sent in by operators from time to time, and recommended by them. The author does not vouch for their excellence.
Size of Reels. — There has been some inclination to increase the size of reels to two and even three thousand feet, which is, I think, bad practice. With two projectors there is really no good reason why it should be done, and it is distinctly objectionable for several reasons, one of which is that it increases the probable loss should a fire occur, as well as increasing the volume of fire and smoke.
One thousand feet of film has been and should continue to be the standard reel of film. It is convenient to handle, not overly heavy, and keeps the fire damage risk within reasonable limits. But the reels themselves should be not less than 12 inches in diameter. Personally, I believe a 14-inch reel having a 4-inch hub would be ideal from any and every point of view. The hubs of present reels are too small Small hubs and the old-style takeup tension are a combination which produce heavy strain on the first fifty to one hundred feet of film. But whatever is done in that direction, the reel should be of sufficient diameter that one thousand feet of the thickest film (yes, film stock varies slightly in thickness} will fill it to only within one-half inch of its outer diameter, assuming the film to be wound not too tightly. Thus the whole film will be protected by the metal sides of the reel.