. 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. Fig. 138. and usually made in either copper or tin, is so ruinously extravagant in fuel as to be totally out of the question, fully three-fourths, if not a still larger proportion, of the heat generated by the (atmospheric) gas burner passing directly away by
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. 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. Fig. 138. and usually made in either copper or tin, is so ruinously extravagant in fuel as to be totally out of the question, fully three-fourths, if not a still larger proportion, of the heat generated by the (atmospheric) gas burner passing directly away by the flue-pipe and being wasted. Some of the newer forms extensively advertised are but little better than the above, but others again afford vastly better results, and consume but little gas or oil in proportion to the work done. Some of the tubular forms are very good, those fitted with a number of horizontal tubes being much more economical than such as have vertical tubes only, though these are immensely superior to the old conical boiler. These tubular boilers on a small scale are however somewhat costly, and require frequent cleaning also. On the whole, de- cidedly the most simple and at the same time generally effective j, j^ jgg apparatus of this kind. 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 work.. Ravenscroft, B. C. London, L. U. Gill; New York, C. Scribner's sons