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MANAGERS AND PROJECTIONISTS 887
COMPOSITION OF EXAMINING BOARD.— It is hard to say just what the make-up of an examining board should be. The following is perhaps as near the composition of a competent examining board as it would be possible, everything considered, to get: (a) One thoroughly competent, practical electrician ; (b) the head of building or fire inspection department; (c) one man who is thoroughly acquainted with practical projection room practice — in other words, a competent projectionist.
THE EXAMINATION.— The examination of projectionists should seek to determine : (a) Their knowledge of electrical action in general; (b) their knowledge of electrical action as applies to the ordinary multiple arc and three-wire system — particularly the latter; (c) ability to measure wires, to calculate their ampere capacity and their general understanding of what various things happen, or may happen, when a wire is overloaded, and why they happen; (d) their knowledge of what types of installation (wiring, etc.) are permitted for -use under various conditions met with in the theatre; (e) extent of their knowledge of the principles involved in transformers, and of the construction, connecting and operation of low voltage transformers or economizers such as are used in projection rooms ; their knowledge of motors and motor generators, particularly as applies to the care of the commutator, brush tension, methods of fitting the brushes to the commutator and testing for possible electrical faults ; (g) knowledge of the principles involved in, and the practical operation of the mercury arc rectifier, if they are used in the territory ; (h) knowledge of principles involved in fusing, including knowledge of all places where fuses are required, and what types of fuses it is permissible to use in .a theatre; (i) knowledge of rheostat resistance and its application to the projection circuit; (j) Knowledge necessary to determine whether or not wires are large enough to carry any given current, considering length of circuit; (k) knowledge of the various points in projection room construction and equipment, including proper methods of port fire shutter suspension, fusing port fire shutter suspension system, particularly as applies to location of fuses, and method of manual operation of same; (1) knowledge of the projection mechanism and of the light source ; (m) knowledge of film, including how to make a proper, straight, smooth splice, the effect of worn sprocket teeth on the film and on the projected picture; the effect of worn aperture plate tracks on screen