. Greenhouse construction and heating: containing full descriptions of the various kinds of greenhouses, stove houses, forcing houses, pits and frames, with directions for their construction, and also descriptions of the different types of boilers, pipes, and heating apparatus generally, with instructions for fixing the same. Greenhouses. PITS AND PBAMES. 125 the roller up, with the blind rolled on it, to the top. A long openrsided box, or pent-house, is fixed along near the ridge to receive the blind, and protect it from the weather (see Fig 80). There can be no doubt of this being decidedly
. Greenhouse construction and heating: containing full descriptions of the various kinds of greenhouses, stove houses, forcing houses, pits and frames, with directions for their construction, and also descriptions of the different types of boilers, pipes, and heating apparatus generally, with instructions for fixing the same. Greenhouses. PITS AND PBAMES. 125 the roller up, with the blind rolled on it, to the top. A long openrsided box, or pent-house, is fixed along near the ridge to receive the blind, and protect it from the weather (see Fig 80). There can be no doubt of this being decidedly the best system of working blinds on greenhouse roofs. The details, such as the arrangement of the pulleys and working cords, may be varied to some extent, but the principle remains. But even by this method the rollers must be neither very heavy nor too long, or the blind will soon give way. A hollow metal tube— preferably of tin or brass—is superior to wood in its greater rigidity and lightness, and lengths of 20ft. or 26ft. should not be exceeded, even with this material. When the house ^'''- di- does not exceed the above in length, a single roller may be employed, with a good sized pulley at each end, which should overhang the ends of the structure slightly. In this case the blind may rest, and the rollers run, right down on the bars or rafters, but where more than one length of roller is required the blinds and rollers must be kept up off the roof by means of iron rods fixed as shown in Fig. 81. Without these the pulleys could not work, or even be fixed in place, and beyond this it is found that better results are obtained when the blind is elevated a little way above the Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ravenscroft, B. C. London, L. U. Gill; New York, C. Scribner's sons
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectgreenho, bookyear1901
