. The principles of ventilation and heating and their practical application. very tight in the window frames,tolerable uniformity of ground tempera-ture is reached.* About one-third of the effect is dueto radiant heat and the rest to heatcarried by the air which rolls up theheated sides of the stove and pipe. Inthe best forms of base-burner, with thincastings and relatively large surfaces ofmica near the glowing coals, the propor-tion of radiant heat is greater than this,amounting to over one-half the totaleffect. To arrange an ordinary cylinder orbox stove so that it shall warm the freshair e
. The principles of ventilation and heating and their practical application. very tight in the window frames,tolerable uniformity of ground tempera-ture is reached.* About one-third of the effect is dueto radiant heat and the rest to heatcarried by the air which rolls up theheated sides of the stove and pipe. Inthe best forms of base-burner, with thincastings and relatively large surfaces ofmica near the glowing coals, the propor-tion of radiant heat is greater than this,amounting to over one-half the totaleffect. To arrange an ordinary cylinder orbox stove so that it shall warm the freshair entering the room, the essentialthing is to surround it with a jacketof sheet iron or zinc, leaving the necessary opening for access to thestove, and then to connect through an opening in the floor the spacebetween the jacket and the stove with the outer air. The amountof air which will be thus introduced will depend not only on the area ofthe opening and the difference between the temperature of the roomand that of the open air, but also on the arrangement made to secure. Figure 12. * The Sanitary Engineer, September i, 1880, page 372. VENTILATION AND HEATING. 87
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