Light and lighting . this data may be satis-factory to you. Some of it has beenobtained by conference with ProfessorGeorge M. Whipple, of Cornell Uni-versity, who has made a special study ofschoolroom conditions. Prof. Max Gruber (Munich) :— (1) Twenty-five metre-candles mea-sured by direct method (equivalent to10 measured with red screen). (2) Same as above. (3) No inconvenience if shadows areavoided. (4) Cannot be answered in terms ofdefinite numerical data. (5) Best method is to specify the solidangle (Raumwinkel). (6—11) Fifty reduced square degreesmin. for each desk. See also paper
Light and lighting . this data may be satis-factory to you. Some of it has beenobtained by conference with ProfessorGeorge M. Whipple, of Cornell Uni-versity, who has made a special study ofschoolroom conditions. Prof. Max Gruber (Munich) :— (1) Twenty-five metre-candles mea-sured by direct method (equivalent to10 measured with red screen). (2) Same as above. (3) No inconvenience if shadows areavoided. (4) Cannot be answered in terms ofdefinite numerical data. (5) Best method is to specify the solidangle (Raumwinkel). (6—11) Fifty reduced square degreesmin. for each desk. See also paper pub-lished in the Gcsundheits-Ingc»ieitr. J.«> 18, and abstracted in the last numberof The Illuminating Engineer (p. 30). (12) No. If a certain solid angle, to b<subtended at each desk, is ,the necessary distance of other buildings,and the position, height, and breadlh olthe windows. &c, ran all be calculatedbeforehand. (See paper referred toabove.) 98 THE ELLUMINATING ENGINEER (feb.). A History >>> Royal Socii ty oj . I lis. BySir Henry Trueman Wood. {Jo/,,,Murray, ATbemarU strut. London. net.) Probably few people, even those who(•mint themselves members of longstanding, realise the vast scope of the workundertaken by the Royal Society of Artemho- its foundation in 1764. Sir BenryTrueman Wood, in writing this history,has d<m<- a service both to the Societywith which he has been bo long andhonourahlv connected and to the deal- with a range f subjects thati- almost bewildering. We Learn of theSocietys constant endeavours to en-courage experiments in such matteoforestry, colonial enterprise, weaving,paper making, and lithography; itsencouragement of music, art and technicaleducation, and we realise for the firsl I imehow many ar< the movements of to-day which the Royal Society of Arts initiated. red, and finally allowed to develop anindependent existence. It organised thetir-t public exhibition of the worksof arti
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