Light and lighting . ith a Bunsen screen—and to instruct the man incharge of the lights to switch on whenhe could to disappear or to bee,,me bright. The club waiter,for instance, would be told to switch 09the lamps when he saw the light comingthrough the spot, and to switch onenough to darken it. It would relievehim of the responsibility of judging whento turn on the lamps. It might be remem-bered thai fully twenty \ go Bidwell exhibited at thePhysical Society a little selenium cellrelay and a lamp, and this cell, as thedaylight faded, acted as a relay and turnedon the lamp automat
Light and lighting . ith a Bunsen screen—and to instruct the man incharge of the lights to switch on whenhe could to disappear or to bee,,me bright. The club waiter,for instance, would be told to switch 09the lamps when he saw the light comingthrough the spot, and to switch onenough to darken it. It would relievehim of the responsibility of judging whento turn on the lamps. It might be remem-bered thai fully twenty \ go Bidwell exhibited at thePhysical Society a little selenium cellrelay and a lamp, and this cell, as thedaylight faded, acted as a relay and turnedon the lamp automatically. A goodileal had been done in recent years withselenium, and different material- sensitiveto light, and something of that sortmight be done. If the day graduallybecame dark in the middle of the the daylight illumination went downto, Bay, three-quarters of a foot-candle,this lamp would be automatically lighted, PELHAM ROAD SCHOOLS — WIMBLEDON HORIZONTAL DAYLIGHT ILLUMINATION ON DESKS IN FOOT-CANDLES. CEHlfiAL HALL PELHAM ROAD SCHOOLS WIMBLEDON- HORIZONTAL OAYLIOHT ILLUMINATIONON DESKS IN FOOT-CANDLES THE ILLUMINATING ENGINEER (feb.) 83 but if the daylight went up to 5 or 6foot-candles some means would have to beprovided for turning down the artificiallight. With regard to the eye rejectingmore than 1 foot-candle, as had beensuggested by Mr. Waldram, he thoughtthis required a little modification orexplanation, and a physiologist wouldhave to be turned on to the problembefore they got to the bottom of was a subjective matter. Prof. W. C. Clinton remarked thatthe carves shown by Mr. Waldram, havingreference to the illumination in a roomand its model, were in very fair agree-ment at those stations near the windows,where most of the light came direct fromthe sky. Further back in the room,where this direct light was lost, and theillumination was due to reflection fromthe building opposite, there were ratherlarge percentage differences, undoubtedlydue to the
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