Handbook of projection for theatre managers and motion picture projectionists ([1922])

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894 HANDBOOK OF PROJECTION FOR record of the reading in a book kept for that purpose. This is not only a goodly precaution, but it enables the computation of the current consumption at any time it may be desired. For instance, when the man reads the meter, it registers 1,000 kilowatt hours, that being on the first of the month. On the 10th of the month you take another reading, and the difference between the two will indicate the energy consumed during that period. KNOW LEDGE IS POWER.