Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ars, galvanized iron has comeinto use for greenhouse roofs. The framework consistsof angle and T iron, pat up in about the same way aswhen wooden sash bars are used. The ridge cap, cor-nice, gutters, and all exposed parts of the roof, are ofgalvanized iron. One of the simplest forms of iron sash bars is shownin Fio-. 33. It is made and used in the erection ofconservatories, by M. H. Crittenden k Son, of Minneap-olis, Minn. As
Greenhouse construction : a complete manual on the building, heating, ventilating and arrangement of greenhouses, and the construction of hotbeds, frames and plant pits . ars, galvanized iron has comeinto use for greenhouse roofs. The framework consistsof angle and T iron, pat up in about the same way aswhen wooden sash bars are used. The ridge cap, cor-nice, gutters, and all exposed parts of the roof, are ofgalvanized iron. One of the simplest forms of iron sash bars is shownin Fio-. 33. It is made and used in the erection ofconservatories, by M. H. Crittenden k Son, of Minneap-olis, Minn. As will be seen, it much resembles, in 48 GREENHOUSE . CONSTRUCTION. shape, some of tlie forms of cedar sash bars, and consistsof heavy galvanized iron, bent as shown in tlie illustra-tion. At the lower edge are bioad drip gutters, whichwill not be likely to become clogged. Tlie glass may belaid, in any way desired, with putty. A Y-shaped cap(2) rests upon the top of the sash bar, and is held firmlydown upon the glass (3) by means of copper clips (4).Unless the purlins are placed quite close together, itwould seem likely that the sash bars would sag, although /r^^S^. FIG. 33. WITHOUT COKE. FTG. 34. WITH STEEL COREGALVANIZED IRON SASH BARS. a number of large houses are put up in this way, and aresaid to be giving good satisfaction. A form of sash bar that differs from Hie above, byhaving a core of steel thrcc-sixteentlis of an inch thickin the center to add to its strength (Fig- 34), is alsoused. Tlie clip holding the glass is drawn down by abolt. This, of course, is stronger than the other, butthe cost is more. From the form and method of puttingup these sash bars, there can be but little heat lost, from GALVANIZED IRON SASH BARS. 49 radiation by the iron, and as the gutters seem to bearranged to catch all of the moisture condensed, thereseem^ to be fewer objections to these sash bars than toalmost any of the metallic sash bars. CHAPTER IX. THE PITCH OF THE ROOF. All plants requi
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Keywords: ., bookcentury1800, bookdecade1890, bookidgreenhouseco, bookyear1894
