Light and lighting . eaTop of glass shouldmake an angle notless than 30° withmost remote desk. Primary X 7 m. m. 30-35scholars. Window glass , Floor area Yes. Most useful. Very variable,often 1 : 50. but Have met no badresults from bi-lateral lighting. Unilateral glassuseful to lightmore remotedesks. Unilateral. Over-head lighting pre-ferable to windowson right. (a) Yes. (b) Depends onproportion oflight in two rooms. Light wall pre-ferable. Doubtfulexpedient. Yes. Unsatisfactory. Good reflection im-portant. 41 THE ILLUMINATING ENGINEER
Light and lighting . eaTop of glass shouldmake an angle notless than 30° withmost remote desk. Primary X 7 m. m. 30-35scholars. Window glass , Floor area Yes. Most useful. Very variable,often 1 : 50. but Have met no badresults from bi-lateral lighting. Unilateral glassuseful to lightmore remotedesks. Unilateral. Over-head lighting pre-ferable to windowson right. (a) Yes. (b) Depends onproportion oflight in two rooms. Light wall pre-ferable. Doubtfulexpedient. Yes. Unsatisfactory. Good reflection im-portant. 41 THE ILLUMINATING ENGINEER NIGHT ILLUMINATION OF A SWIMMING POOL. The Del mar Swimming Pool at has recently >»*ii illuminatedartificially by electric li<.M and theinstallation was described in a recenlDumber of the Electrical World. Twenty- becoming quite a popular pastime ; weunderstand from the Electrical Co. ofMissouri, to whom we are indebted forparticulars and the accompanyingphotograph, thai this the third installa-. five 500-watt lamps (tungsten) an tion of the kind carried ou( within the suspended on cables bung across the year. pool. This pool ia very popular during The other two consisted respect ummer, and the new lamps have of 6-light tungsten and flame arc lighting, been receiving a greal <l<-al of attention, bul the arrangement Bhown above is Swimming during the time is Btated to -jive much the best results HERR ING. ALBERT WEISS. It ia with great regret that we record the death of HerrWi th< Treasurer of theNational Illumination Commission, which took place at Zurii h on Decembei 16th. All who Icne* \\, lethal the Commission has lost the services of one who would have labov foi its we i d who in bh< pasl had very ably ted Prof. Vsutiei in the work of the International Photometric Commission. THE ILLUMINATING ENGINEER (jan.) 45 THE ARTIFICIAL LIGHTING OF ADVERTISEMENT POSTERS. The increasing number of advertisementhoardings in the streets is a f
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