Light and lighting . laneof reference of 575 sq. ft. would give anaverage illumination of 3570575 = 6*2 foot-candles. Table VIIL Summary of Calculated Values. Fis. 14. Ilium, in Ilium, in Ilium, in Position. Position. Position. I. 5-5 A. 0-61 E. 2-46 II. 5-5 B. 1-50 F. 1-99 III. 5-5 C. 0-98 G. 1-65 IV. 5-5 D. 0-51 H. 0-84 V. 6-6 The tabulation for the point A is givenbelow in Table IX , and the polar curveof the combined unit is shown in Fig. test under the lamps gave about The mean value calculated from the results of Table \ III. is approximately ?™9= 3-7 foot candle
Light and lighting . laneof reference of 575 sq. ft. would give anaverage illumination of 3570575 = 6*2 foot-candles. Table VIIL Summary of Calculated Values. Fis. 14. Ilium, in Ilium, in Ilium, in Position. Position. Position. I. 5-5 A. 0-61 E. 2-46 II. 5-5 B. 1-50 F. 1-99 III. 5-5 C. 0-98 G. 1-65 IV. 5-5 D. 0-51 H. 0-84 V. 6-6 The tabulation for the point A is givenbelow in Table IX , and the polar curveof the combined unit is shown in Fig. test under the lamps gave about The mean value calculated from the results of Table \ III. is approximately ?™9= 3-7 foot 204 THE ILLUMINATING ENGINEER (april) Table Illumination Values for Position A. Fig. 14. Lamp. Total dist. Total dist. Cos. e 9 I. Nor. ilium. I. 715 26-715 0-262 74° 50 87 •0318 II. 405 Id! 0-348 69° 40 100 •086 III. 171-6 131 0-535 r,7° 40 107 ?334 IV 482 21-95 0-319 71° 25 97 •064 V. 382 19-55 ? ?•:;.;, 69° 100 -OfM •610 f*LMN Of LtZMriftt, Of SCHOOL CLASS «OOM I i I*. na is polup curve or lAnrnno rirrma uato in tCMOOL cms J »oon in fio I* and as the observed values tended to beless t ban t be calculated valui b, t beutilisation factor baa a maximum value of 3762 60 The low value is largely due t lossthrough windows of relatively grealarea. (6 Local Lighting // Incandescent Gasover hows the Bpacing, and plan of bench,together with calculated and
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