Archive image from page 11 of Dean's system of greenhouse heating. Dean's system of greenhouse heating by steam or hot water, with formulas for obtaining different temperatures .. deanssystemofgre00dean Year: 1901 To reduce ordinary walls, boarded with paper between, to glass surface, divide the number of square ft. by 3. If there is another lining of boards on inside of posts, thus forming an air space, divide by 7. If double boarded and papered both inside and outside, with air space between, divide by 10. Reduce wall surface to glass by dividing same by three. f A=3 ft. I E=6 ft. I 9 f
Archive image from page 11 of Dean's system of greenhouse heating. Dean's system of greenhouse heating by steam or hot water, with formulas for obtaining different temperatures .. deanssystemofgre00dean Year: 1901 To reduce ordinary walls, boarded with paper between, to glass surface, divide the number of square ft. by 3. If there is another lining of boards on inside of posts, thus forming an air space, divide by 7. If double boarded and papered both inside and outside, with air space between, divide by 10. Reduce wall surface to glass by dividing same by three. f A=3 ft. I E=6 ft. I 9 ft. ~r- 3 to reduce to its equivalent in glass surface = 3 ft. Glass Equivalent over Roof r Wall surface equals 3 ft. Glass exposure I B '2 ft. 3 in. I C '13 ft. 3 in. : D '7 ft. Total glass equiva- 25 ft. 6 in. lent over roof 'When glass equivalent is fraction of a foot less than one- half, use the next larger 'width over roof.'
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