Electrical Laboratory Notes And Forms Elementary Series Advanced Series
Electrical Laboratory Notes And Forms Elementary Series Advanced Series
John Ambrose Fleming
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I) to represent the arc and a semicircle, BDC, drawn round it with radii spaced 10 degrees apart. On these radii are set out distances to represent to any scale the illuminating power in that direction in terms of the standard, and a curve, A P N, drawn passing through all these points. This curve will then represent the candle-power of this arc in different direc- tions. The mean spheri- cal candle-power can be obtained from it geometrically as fol- lows : Draw a vertical line, EF, which is a ...tangent to the semicircle at D, and which is therefore parallel to the vertical line through the arc. From the ends of the radii of the semicircle drawn at intervals of N 10 degrees draw hori- zontal lines ; and, start- ing from the vertical line, set off on these horizontal lines dis- tances equal to the The extremities of these Thus the ordinate SP' ri illuminating power of the arc in those different directions. lines define another curve, as shown in the diagram in Fig. 1. of the curve E P' N' F is equal to the radius A P of the photometric curve A P N.
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