The lighting of school-rooms; a manual for school boards, architects, superintendents and teachers (1904)
Rowe, Stuart Henry, 1869- · New York, London [etc.] Longmans, Green, and co. · leaf 69
FiG. 22.—MuUions, after patterna by Briggs. dow-boxes; but, on the other hand, they may moreeasily get out of order and are not so easily repairedas weights and pulleys. A revolving sash (see Fig. 23) may be used wherescreens are not needed. Though of little or no ad-vantage for the lighting, they…
School hygiene · Lighting
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