. 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. 184 GREENHOUSE OONSTEUCTION AND HEATING. or 3,000ft. Its construction being, however, some- what complicated, renders it a rather more expensive boiler than some others. It is usually constructed to be fed through the crown, as shovm, the fire-door being only
. 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. 184 GREENHOUSE OONSTEUCTION AND HEATING. or 3,000ft. Its construction being, however, some- what complicated, renders it a rather more expensive boiler than some others. It is usually constructed to be fed through the crown, as shovm, the fire-door being only used for stoking purposes, cleaning the bars, etc. It is best set as advised above, with narrow return flues and mid-feathers on each side, as shown in the illustration. The "Gold Medal" or "Express" boiler (Fig. 125) is yet another form of the saddle, but vTith three flues through the crown instead of two, the draught passing forward through the larger central one first, and then returning through the two smaller ones on each side, to the chimney at back. Though a power- FiG-126. ful and with some a favourite boiler, we con- sider this inferior to the Climax, as the flues in the crown being so small require frequent cleaning, while there is not so much surface exposed directly to the fire, and, lastly, without an unusually high chimney to increase the draught the considerable heating surface at the sides is wasted. This fault can be overcome by bringing the draught from the two side-flues in the boiler forward again by means of two other narrow ones, with or without mid-feathers constructed outside it, as shown in Fig. 120. But this. 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
