. Motion picture electricity. e hydrogen. Whenthe right proportion is reached, the light will burn withoutany noise whatever and almost no flame. If too muchoxygen is turned on it will produce a roaring noise, andif the oxygen is allowed to flow too much in excess of itsproper proportion, the light will extinguish itself with asharp snap. Should this occur, it will be necessary toturn off the oxygen and immediately light the hydrogen,or turn both off and start anew. In adjusting the flow ofoxygen in proportion to the hydrogen, it is necessary toturn the valves slowly, so as to be able to stop
. Motion picture electricity. e hydrogen. Whenthe right proportion is reached, the light will burn withoutany noise whatever and almost no flame. If too muchoxygen is turned on it will produce a roaring noise, andif the oxygen is allowed to flow too much in excess of itsproper proportion, the light will extinguish itself with asharp snap. Should this occur, it will be necessary toturn off the oxygen and immediately light the hydrogen,or turn both off and start anew. In adjusting the flow ofoxygen in proportion to the hydrogen, it is necessary toturn the valves slowly, so as to be able to stop when the 266 MOTION PICTURE ELECTRICITY right proportion is reached. The surface of the limeshould be about one-eighth to one-fourth of an inch fromthe opening of the jet, to obtain the best results. ADJUSTMENT OF LIGHT Successful results in projection depend largely upon thecorrect adjustment of the lamp, which must throw abrilliantly illuminated circle upon the screen. After the objective is focused, as will be evidenced by. Fig. 127 a sharp clear image on the screen, remove slide and slide-holder, and examine the illuminated circle. If the lightis centered and the lamp correctly adjusted this circle willbe clear and entirely free from coloration or shadows. Fig. 127 illustrates the results of defective centering,showing the shadows and stating the causes. These canbe speedily remedied and a little practice will soon makeone adept in centering the light accurately. In Figs. 1 and 2 the radiant, i. e., the crater, needs to beproperly adjusted laterally, it is too far to the right or left. In Figs. 3 and 4 it is too high or too low. In Fig. 5, 6 and 7 it is too near or too far from thecondenser. Fig. 8 shows it to be in correct position, the field beingentirelv clear. MOTION PICTURE ELECTRICITY 267 These instructions hold good for the electric arc as well. The lime cylinder should be turned as often as everyfive minutes. Failure to do this is liable to form a pit inthe surface
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