Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ur-nish, or in the economy of their coal consumption. Forcool houses, or when carryingabout two-thirds of their fullradiation, they give very satis-factory results. While theirfire surface is very etfectivelyarranged, it is rather small forthe grate area, and, in casethe heaters are working up totheir full capacity, in verycold weather, there will be aconsiderable loss of heatthrough the smoke flue. Withthese heaters, as with
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ur-nish, or in the economy of their coal consumption. Forcool houses, or when carryingabout two-thirds of their fullradiation, they give very satis-factory results. While theirfire surface is very etfectivelyarranged, it is rather small forthe grate area, and, in casethe heaters are working up totheir full capacity, in verycold weather, there will be aconsiderable loss of heatthrough the smoke flue. Withthese heaters, as with others,it is economy to select onethat is a size larger than wouldbe really necessary. For smallgreenhouses the WeatheredConical Heater (Fig. 67) or ^^^ ^^- spence of similar construction will be found quite pow-erful and eflBcient. In Fig. 68 we present the Spence as showing thegeneral form of the horizontal sectional heaters. Thefire-pot is surrounded with a water jacket so that a fire-brick lining is not required. The sections are arrangedparallel, one above the other, over the fire-pot. Theconstruction of the flues is such as brings the products. 118 GREENHOUSE CONSTRUCTION. of combustiou repeatedly in contact with the lieatingsurface, and if this is not sufficient to absorb all of theheat, the difficulty can be corrected by the addition ofmore sections. The first, third, and fifth sections areshown in Fig. G9, and the second and fourth in Fig water is spread out in a thin sheet in the sectionsand cannot enter the feed pipes until it has made a com-plete circuit of one section. By tlie arrangement of thewater column in the rear, the water having passed throughone section, is prevented from entering another. Thepoints claimed for this heater are, economy of fuel, per-fect and rapid circulation, readiness of cleaning, few andtight joints, and, in case of leakage or breaks, the readi-
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Keywords: ., bookcentury1800, bookdecade1890, bookidgreenhouseco, bookyear1894
