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MOTION PICTURE HANDBOOK
of operation of these outfits. Still another plan, followed by some, is to purchase oxygen in tanks and combine it with ordinary illuminating (coal gas) gas from the gaslight system. When this is done, due to the very low pressure of the illuminating gas as compared to that of the oxygen in the tank, it is advisable, and even necessary to have a speciil form of mixing jet for the lamp. What is known as the "blow-through" jet (to be had of any dealer in limelight supplies) is usually employed for this kind of work. This jet is illustrated in Fig. 317. The use of the oxygen-illuminating gas combination is not to be recommended for amateurs.
Limes. — Limes may be had in several sizes, up to \l/± inches in diameter. The largest size is not the best, however, because it is apt to flake off or even break under the action of heat. A oneinch lime is preferred by most operators, though some use seveneighths inch.
Limes come in sealed cans or jars, packed in powdered lime. They must not be removed from the package until needed, and the package must be kept sealed. If exposed to air containing moisture the limes will slack, or if there be no moisture then
they will become haid and unfit for use. Limes are quite fragile and easily broken.
Limes must be placed in the burner so that they will stand perfectly straight and not wobble even the least bit when revolved. If not set true there will be uneven illumination of the screen as the lime is revolved during the progress of the show, to expose a new surface to the flame. The unevenness will be due to varying distance of the lime from the tip of the burner.
Starting the Light. — Starting the light is an operation which, while simple, requires the exercise of cons'derable care. Having placed the lime in position in the lamp, or burner, as it is usually called, and turned it up so that it does not "wobble" when rotated, pull the lime away from the burner tip from one-half to one inch, and, having turned on
Figure 317.