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MANAGERS AND PROJECTIONISTS 787
The crater area per ampere is decidedly less than that of the ordinary arc. By this we mean that a 75-ampere high intensity crater, for instance, will have very much less diameter and area than will a 75-ampere ordinary arc crater. Exactly how great an advantage this is we are not prepared to say, but certainly it is an advantage because it seems quite possible to secure all the screen brilliancy any reasonable man could want without encountering the inefficiency under which the ordinary projection arc labors when working at high amperage. See pages 393 to 396.
The point of highest efficiency of the ordinary D C arc is about 60 amperes. We believe there would be no appreciable loss in efficiency with the high intensity arc until the 100 ampere, or possibly 120 ampere, point was passed.
COLOR OF LIGHT.— Screens illuminated by the high intensity arc are very brilliant, but the light tone is not, at this time (1927) as warm in tone as is the light from the ordinary arc. Nothwithstanding this phase of the matter, which may be corrected later, the public seems to like the high intensity screen illumination. We have not heard a single theatre patron criticize it adversely, but have heard many express approval of the brilliancy of the light.
CURRENT STRENGTH.— High intensity carbons are designed to work at a certain definite amperage. See page 400y2 If you want the best results do not depart therefrom. If you do depart therefrom and trouble and damage to the apparatus results, do not blame anyone but yourself.
There are those who think that because they can operate an ordinary arc lamp at almost any desired amperage, they can do the same with the high intensity lamp. If you have any such idea you had better revise it, and come to an understanding of the apparatus you are handling. If your lamp is rated at 75 amperes and 60 volts, that amperage and voltage