Illuminating Engineering Society, Association of Public Lighting Engineers (Great Britain) · [London] · leaf 265
)efore badly hghted streets could befound. The darkest spots were chosenin the last three streets, but care wastaken in all cases that no shadow froma lantern frame fell on the photometer.Accurate levelhng was necessary in theselater measurements. The results of these photometrictests—which are set… … Fig. S.—Results of photometric measurements. By inadvertence, the class letters are not the same as those suggested in the Specification. Arepresents the lowest class, viz., niinin;uin htlow 001 foot-candle. B is from 001 to 0C25. C isfrom 0-025 to 0 04. D is fiom 004 to 0 06. Ei.s froni006 toOl.…
Lighting
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