F. H. Richardson's bluebook of projection (1935)

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DEFINITIONS 679 gether, between which the film enters the projector magazine. The rollers hug the film so closely that fire cannot pass. Magniscope A special wide angle lens by means of which special screens may be projected in huge enlargement. i 72 , Magnet, Permanent Soft iron impregnated with magnetism which it retains constantly, in contradistinction to an electric magnet that looses its magnetism when not in active use. Magnetic Field Region surrounding the poles of a magnet through which flow lines of magnetic force. Strongest in proximity to the poles, weakening rapidly as distance therefrom is increased. Magneto A device for generating electricity by electro-magnetic induction. It consists of a permanent magnet and an armature rotated by a hand crank. Excellent for testing for grounds. Master Blade Blade of projector rotating shutter that covers the lens while the intermittent sprocket is in motion. Mean Spherical Candle Power Average spherical candle power. Meter (a) An instrument employed for measuring substances or those used to measure elements constituting electric power, (b) A unit of length in the metric system equaling 39.37 inches. Mica A natural mineral substance that may be split into