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FOR MANAGERS AND OPERATORS 683
where a guil pastil, ozo-carbi, or Bliss Oxy-Hydro-Cet Light is used, as the illuminant is too bright. When trying out the one-wing shutter idea, it will be well to run the machine a little above normal speed. The gain in light will compensate for a slight flicker and some injury to the action in the film. The reason a one-wing shutter may possibly be used for limelight projection is that flicker is very much less pronounced with a weak illuminant than with a bright one. It is a matter of screen brilliance.
Screen. — For limelight I would by all means advise one of the best semi-reflecting screens obtainable. If a muslin or plaster screen is used be sure it is perfectly clean and white. A Mirror screen would be ideal, but is too costly to be conr sidered for a gas installation. Outline your picture in black (see Page 178) and have the room as dark as you can possibly get it. This is especially important when using a comparatively weak illuminant.
Guil Pastil. — Guil Pastil is the invention of one M. Guilbert, a Frenchman. It was first imported into the United States, in 1913, by C. E. Lindall, Bar Harbor, Me. Mr. Lindall submitted samples to the Projection Department of The Moving Picture World, which had them tested by practical gas men, who, without exception, reported favorably. The pastil is unquestionably a big improvement over the lime, for which it is a substitute. It is made of thorium, ittrium and other rare earths, found mostly in South America. Instead of setting upright in the burner it is held in horizontal position, the jet playing on its end. It does not need to be revolved, as does the lime, and once adjusted should not be moved. Its density is such that little or no pit is formed by the jet. It comes in different sizes, but the largest, 1/4 by 13/16 inch, is most popular with operators, and is the size recommended by the importer. The pastil is not affected by dampness, but, owing to its density and the fact that is is a very poor conductor of heat, is very brittle, and must be heated very slowly, else small pieces are apt to snap off, thus injuring the pastil.
The hydrogen will often blacken the pastil while heating, but this does no harm, since as soon as the oxygen is turned on the blackness disappears. If preferred blackening may be avoided by pulling the pastil away from the tip until the light has been adjusted to about what experience tells the operator it should be, and then the pastil slowly advanced to its normal position. Do the advancing very slowly, however, or you may injure the pastil.