Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 161
acketed terms, measuredout respectively as lengths on the twoextreme scales; these scales beinggraduated in terms of x, while the centralscale is graduated in terms of /. Any introduction of a difference inthe distance, I, will be equivalent todisplacing the scale, I, along it-self, the… … Fig. L Abacus with three linear scales. 00 origin line of the three scales. / scaleof candlepower expressed in megacandles;this scale carried values of \ log /. The scalecan be so arranged that the zero falls above 00at a point B such that the absolute value ofAB=[i?]. The values carried by the…
Lighting
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