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

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FOR MANAGERS AND OPERATORS 33 E of Thumb." It is expressed for general use as: . CR To use the formula you have but to cover the symbol or letter representing the quantity desired, and what remains will produce the answer, thus: Suppose we wish to ascertain the resistance in ohms. We cover up the "R" in the formula E and find that we have — remaining, which will give R, the C desired quantity. In using this formula on projection circuits the top letter must be expressed as E minus the arc voltage, the same as in the regular formulas, thus: E-48 E— 45 E— 35 or for D. C. and for A. C. CR CR CR Go to your work each day as though it ^vere your first day on a new job and you had to make good.