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

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698 RICHARDSON'S BLUEBOOK OF PROJECTION Transformer A device for efficiently alternating ax. voltage and amperage by means of magnetive induction. Transformer Loss The loss inherent in transformers should be less than ten per cent. Traveling Arc An unsteady electric arc in which the point of highest luminosity moves about. T.PS.T. Switch A triple pole, single throw switch. It has three blades and makes or breaks on one set of contacts only. Two-phase Current An E.M.F. in which the two current waves differ by 90 degrees. Ultra Violet Waves Lieht rays existing beyond the visible, spectrum. Such rays are said to vibrate in excess of 800 billion times per second. They are effective in photography. Unbalanced Load As applied to a 3-wire circuit, a condition in which more power is being taken from neutral and true positive than from neutral and true negative, or vice versa. Has the effect of loading one generator more heavily than the other. Underwriters' Rides See "National Electrical Code." Useful Life Term applied to length of life equipment may attain without too much loss in efficiency, either in operation upkeep or by comparison with later, more improved equipment.