Motion picture handbook; a guide for managers and operators of motion picture theatres ([c1916])

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674 MOTION PICTURE HANDBOOK applying only to certain localities. For instance: How about mosquitoes? It is rather a questionable proceeding to build an airdome in a mosquito infested district. Projection by Limelight WHAT is known as "Limelight" is produced by directing the flame of hydrogen mixed with oxygen against a pencil of unslacked lime, or a pencil of a substance know as "Guil Pastil." The flame in itself has slight brilliancy, but is exceedingly hot, and raises the temperature of a spot on the lime or pastil to incandescence, and it is from this spot all illumination emanates. While limelight is next to electricity in brilliance, still it cannot be said to approch the electric arc for moving picture projection, although it may be made to serve very well for stereopticon work. Those who by force of circumstances are compelled to project moving pictures with limelight will be zvell advised to select films of the least possible density and not attempt the projection of a large picture. The writer considers it unwise to attempt more than a ten-foot picture with limelight, and an eight foot one is much better. True, some do project a twelve-footer, but illumination is not very good. The amateur had better not try more than eight feet. Tank Gas. — The best method of producing limelight is by purchasing the oxygen and hydrogen in tanks. Companies in large cities make a business of filling steel tanks with these gases and selling them, or rather the gas in them to exhibitors, the price ranging from 10 to 15 cents per cubic foot. The oxygen tanks are painted red and the hydrogen tanks black. The tanks are usually loaned to the exhibitor free of rental, the exhibitor making a suitable cash deposit to insure their return. Usually tanks may be had in two sizes, viz:, one containing 25 and one containing 50 cubic feet. The two sizes weigh about 50 and 100 pounds respectively. They are shipped by express, and if the distance be long the shipping charge may make the gas very expensive. A pair of 25-foot tanks should by reasonably economical management last for about three ordinary shows and the larger ones for six shows. This will, however, depend on the length of show, size of burner jet and skill of the operator. Assuming five ordinary reels of film, many operators are satisfied to get two shows from the 25-footers and four from the fifties.