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THE PROJECTOR 299
ment will be magnified on the screen, in the form of an up-and-down movement, as many times as 0.600 is contained in the height, in inches, of the screen image, provided the trouble is due to faulty rotation of the intermittent sprocket. Any lateral (sidev tovement of the intermittent sprocket will be magnified on the screen as many times as 0.825 is contained in the width, in inches, of the screen image.
Intermittent Lubrication
(41) Considering the foregoing it is obvious thai such movements must be lubricated with carefully selected oil. Many theatre managers refuse to buy high grade oil, and then wonder why intermittent movements cost so much for repairs and replacements. It is best that projectionists use no oil in the intermittent movement oil well except that recommended by the manufacturer. Never use light household oils as they will bind up the intermittent movement quickly — and ruin it. The intermittent oil well should be drained and filled with fresh oil following each 100 hours of operation, but do not flush out the well with kerosene or other liquid. If you do, some portion of it will remain to impair the lubricating properties of the fresh oil. Filling up the oil wells periodically will not do. As oil is used its lubricating qualities gradually wear away and if it is mixed with fresh oil, the fresh oil loses its full strength. Draining at regular intervals is therefore essential. 1 I<»w ever, these instructions, which apply to most make projectors, do not apply to all. Check them against the instructions of the manufacturer of your mechanism.
(42) Dates for draining wells may be determined by dividing 100 by the number of hours the theatre operates per day. The answer is the number of days between drainings and refillings.
Intermittent Sprocket
The intermittent sprocket is part of the intermittent movement. (43) The interval during which the inter