Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ncloses alarger body of air than either of the other houses, and itwill be easier to regulate the temperature and the moist-ure in such a house than in a narrow one. In additionto the above reason the wide houses are preferable, asthey have longer rafters and afford more space for train-ing the vines. The curvilinear roof is frequently used for vineries,and in Fig. 99 is shown a section of a curvilinear give somewh
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ncloses alarger body of air than either of the other houses, and itwill be easier to regulate the temperature and the moist-ure in such a house than in a narrow one. In additionto the above reason the wide houses are preferable, asthey have longer rafters and afford more space for train-ing the vines. The curvilinear roof is frequently used for vineries,and in Fig. 99 is shown a section of a curvilinear give somewhat longer rafters for training the vines,but they have no otlier advantage, except, perhaps, in 180 GKEEXHOUSE CONSTEUCTION. appearance, aud Ibis will not counterbalance the in-creased cost. The even span greenhouses, with straight sash bars,seem to be the favorite form for graperies. In theirgeneral construction they do not diiicr from even spanstructures of similar dimensions used for other purposes,and for the details of construction reference is made toChapters V and V^I. There are, however, certain pointsthat should be considered in erecting a grapery. If the. FJG. 98. EVEN SPAN GRAPERY {Section). house is a wide one, the sloi)e of the roof may be lessthan if it is comparatively narrow, and thirty-five, oreven thirty degrees })itch will be sufficient in one case,while forty, or perliaps forty-five degrees, may l)e desir-able in another. In choosing a site for a grapery, it is well to have itsomewhat sheltered from the north and east, and, by allmeans, it should be well drained to the depth of threefeet, that the border may not become wet. The situa-tion should 1)0 such that it will not be affected either bythe shade, or the roots of large trees, which might getinto the l)order and steal from the vines. GRAPERIES. 181 The wall of brick or stone, if either be used, shouldextend for a foot or so above the level, and if a portionof the border is to be on each side of the wall,
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Keywords: ., bookcentury1800, bookdecade1890, bookidgreenhouseco, bookyear1894
