Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . roof will take in more of the lightand heat rays, than would be the case with a span roofhouse. The three-quarter span houses may be likened to alean-to house with the peak of the roof cut off. In thelean-to the heat tends to rise into the angle of the roof, THREE-QUARTER SPAIS HOUSES. 17 and hence is not evenly distributed, but in the three-quarter and even span houses there is less trouble fromthis. The three-quarter span h
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . roof will take in more of the lightand heat rays, than would be the case with a span roofhouse. The three-quarter span houses may be likened to alean-to house with the peak of the roof cut off. In thelean-to the heat tends to rise into the angle of the roof, THREE-QUARTER SPAIS HOUSES. 17 and hence is not evenly distributed, but in the three-quarter and even span houses there is less trouble fromthis. The three-quarter span houses always run eastand west, and the north slope of the roof allows the lightto fall on the plants from all sides, so that the growth ofthe plants will be stronger and more symmetrical. It isthe south slope that is principally relied upon to trapthe light and heat of the sun, and the angle at whichthe glass is arranged is that which will be nearest atright angles to the suns rays during the winter form of house is particularly adapted to theforcing of roses, and of all other plants that need a max-imum amount of light for their development. In Fig. 9. FIG. 9. THREE-QUARTER SPAN HOUSE [Section). will be seen the usual form of forcing house of the three-quarter span style. For adapting it to different crops,the height of the Avails, the slope and length of the sashbars, and the width and height of the benches, can bevaried at pleasure. As a general rule, the three-quarterspan houses are from sixteen to twenty feet wide; thesouth wall is from four to five feet high, and the northone from six to eight feet. The south pitch of the roof% 18 GREENUOUSE CONSTRUCTION. varies from twenty-six to thirty-five degrees, and thenorth one from thirty-five to sixty-five degrees. The side benches are each about three feet wide,and arc phiced about one and one-half feet below thel)lates. The center bench may be single (Fig. G3), witha slope to the south, or double, as shown in Fisf.
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Keywords: ., bookcentury1800, bookdecade1890, bookidgreenhouseco, bookyear1894
