. The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general. 0 or 70cubic feet of volume of a room or green-house like this. We are indebted to W. forthebest formula for workingout the actual requirements under dif-ferent conditions, based on the knownamount of cooliugeffect of glassand wallsurface per squarefoot, walls being takenatabout one-tenth the cooling effect ofglass. His formula has proven correct. its use and the conditions presented by the San Jose greenhouse weget at a very closeresult that is applicable to any
. The Florists' exchange : a weekly medium of interchange for florists, nurserymen, seedsmen and the trade in general. 0 or 70cubic feet of volume of a room or green-house like this. We are indebted to W. forthebest formula for workingout the actual requirements under dif-ferent conditions, based on the knownamount of cooliugeffect of glassand wallsurface per squarefoot, walls being takenatabout one-tenth the cooling effect ofglass. His formula has proven correct. its use and the conditions presented by the San Jose greenhouse weget at a very closeresult that is applicable to any other greenhouse or room under similar conditions. Take as follows: K—represents the amount of radiating surface necessary to counteract the cool-ing effect of the glass or wall surface. 7—The difference in temperature in degrees Fahrenheit desired in the house andthe external air. t—The difference in temperature in degrees Fahrenheit between the temperatureof the heating surface and that of the room or house. C—The number of square feet of glass in the exposed walls with wall equivalentof glass The formula is R g, in which we have r= (600 — 40°) g = Glass roof 3i x 20°. t = (200° — 60°) = 140°. X (of whole surface for glass) ^ Glass windows in side, 132 X 3 Glass equivalent, 2 ends ( wood work), 740 x Vio Glass equivalent, 3 sides (wood work). 530 X Vio 1900 aq. 74 • Or say Then substituting in formula we have20 . sq. ,300 sq. ft. R-- 140 X = square feet
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectfloriculture, bookyea
