. Journal of electricity. square feet, seven 750-wattType C Edison Mazda lamps being used with Ben-jamin Electric Manufacturing Co. bowl type reflectors,the mounting height being 35 feet from ground. Fig. 2 is an elevation and plan of the above. Byusing care in selection of a reflector having a photo-metric curve of suitable characteristics and mountingand spacing the reflector correctly, very desirable re-sults can be produced. In the above case it is shownin Fig. 3 what results can be accomplished by pre-determination of spacing and mounting of units by theapplication of the laws of illumina
. Journal of electricity. square feet, seven 750-wattType C Edison Mazda lamps being used with Ben-jamin Electric Manufacturing Co. bowl type reflectors,the mounting height being 35 feet from ground. Fig. 2 is an elevation and plan of the above. Byusing care in selection of a reflector having a photo-metric curve of suitable characteristics and mountingand spacing the reflector correctly, very desirable re-sults can be produced. In the above case it is shownin Fig. 3 what results can be accomplished by pre-determination of spacing and mounting of units by theapplication of the laws of illumination. In Fig. 3 A and A± are the 750-watt reflectors spaced 40 feet apart and mounted at distance d or32 ft. — 0 in. above the working plane. Foot candles= The photometric curve in candle power forthe various angles is shown at Therefore CP XCOS 3. d2 FC for A and FC for A1 is shown at various distancesbetween the units. The third line shows the resultantfoot candles FC between the units, thus giving an. A PORTION OF THE MACHINE SHOP—Fig. 4 almost absolute uniformity of illumination on theworking plane. In fact the illumination at 4 feet fromthe wall and at the greatest distance from lightingunits shows an illumination of foot-candles. Fig. 4 is a night photograph of a portion of shop. 64 JOURNAL OF ELECTRICITY [Vol. 40—No. 2 THE HEAVY MACHINES of the machine shop by night. In theforeground are 400-watt bowl type re-flectors, the mounting height being29 feet. The bays are 43 ft. by 64 ft.,the units being spaced 21 ft. and 32ft. respectively. In the backgroundof the picture beyond the parallellight streaks which were caused bythe passing of locomotives during thetaking of the photograph, is the ship-ping department, the units beingmounted the same height; but in thiscase one center unit in a width of 43ft., the distance between units being48 feet.
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Keywords: ., bookcentury1900, bookdecade1910, bookidjo, booksubjectelectricity
