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 105
its baseand the base of the school, because the sides, in-cluding the right angle in each, are proportional.Therefore, the corresponding sides being parallel, the 75 76 THE LIGHTING OF SCHOOL-ROOMS hypotenuses of these triangles must be parallel, andthe eye placed at the surface of the desk, it… … Fig. 32. the opposite building. By proving that such an anglemust inevitably be formed where an obstruction isdistant not less than twice its height, we have broughtthis rule into consonance with that other which re-quires that the direct light of the sky be visible fromeach desk. • Conversely, if…
School hygiene · Lighting
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