Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . air. Schools should be so constructed as to permit of ready heatingand ventilation, cleaning, and keeping clean. In large schools themethod will usually be by furnace-heated air, although a bettermethod would probably be by steam- or hot-water pipes. What is known as the Smead system is a most excellent is a combined system of heating and ventilation, consisting of ahot-air furnace, the fresh heated air being admitted through one setof registers, placed in
Text-book of hygiene; a comprehensive treatise on the principles and practice of preventive medicine from an American stand-point . air. Schools should be so constructed as to permit of ready heatingand ventilation, cleaning, and keeping clean. In large schools themethod will usually be by furnace-heated air, although a bettermethod would probably be by steam- or hot-water pipes. What is known as the Smead system is a most excellent is a combined system of heating and ventilation, consisting of ahot-air furnace, the fresh heated air being admitted through one setof registers, placed in the wall near the floor, and the foul air beingtaken out through another set of flues on the same side of the roomand at the same level. This used-up air is then carried from thebuilding through a system of ducts passing beneath the floors ofthe rooms, the heat, by this arrangement, being further utilized to SCHOOL HYGIENE. 231 heat the floors as it escapes. In rural districts the school-room maybe heated by means of a stove, provided with a jacket or cylindersurrounding it, and several feet in height. This is made of tin or. Fig. 27.—a, a, Sash. Fig. 28. J), J), Window-jambs, c, c, Window-sill. Thiscut represents the view from within the Bury Ventilator, in is broken away at one end to show the sash raised above the outerholes to admit the air. Fig. 28.—a, a, Sash. This cut represents the view from withoutthe Bury Ventilator, in operation. The sash is broken away to showthe ventilator behind, with the fresh air passing in. zinc. In the floor, beneath the stove, ho^s are bored to admit freshair, which, warmed in passing over the stove, is deflected upward,and diffused, by means of the jacket. 232 TEXT-BOOK OF HYGIENE. The ventilation of school-rooms must be carried out on theprinciples indicated in Chapter I. With careful and intelligentteachers, natural ventilation will give better satisfaction than a com-plicated artificial system. Where windows and d
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