. La construction de serres et de chauffage : contenant la description complète des différents types de serres, cuisinière, obligeant les maisons maisons, de puits et de cadres, avec les instructions de leur construction, et aussi une description des différents types de chaudières, tuyauteries, appareils de chauffage et en général, avec des instructions pour la fixation de la même. Les serres. 58 GBEENHOUSE CONSTEUCTION ET CHAUFFAGE. de chaque carré de verre peut, bien entendu, être projetée au-delà de la plaque à une distance suffisante pour permettre la chute de la goutte à la gouttière ; mais lorsque cela est fait le verre semble être particulièrement susceptible à la rupture, et à moins d'EAC

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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. 58 GBEENHOUSE CONSTEUCTION AND HEATING. of each square of glass may, of course, be projected beyond the plate far enough to allow of the drip falling in to the gutter; but when this is done the glass appears to be peculiarly liable to breakage, and unless each square sits down very closely on the plate, a good deal of air will find an entrance at this point. In some cases, a strip of zinc, about 4in. wide, is tacked along the outer face of the plate, overhanging STlfficiently to allow of all the drip falling into the gutter. The glass is brought down as far as the edge of the plate, and, of course, overlaps the zinc an inch or two. Copper nails should be used to fasten the zinc in place. Yet another way, and one much favoured by the growers in the Worthing district, is to tack on to the outside of the plate a diamond-shaped fillet or bead, as in Fig. 44. This supports the lower edge of the glass, and conducts i r^ the water into the gutter. â ; But decidedly the best method of all, in my i J opinion, is the adoption of a wooden "drip, " j consisting of a board, 4^in. to Gin. wide, and ^in. â¢;â¢-, r or |in. thick, fixed as shown in Fig. 43. If fixed as at a, with the upper edge flush with [ the ridge on the plate, the ends of the bars ; can be just sawn to shape, but if carried up higher, as at b, the ends of the bars must be "^"'' **" chiselled out. This affords perfect support to the glass, and makes a very neat and tight job. By nailing a 2|in. by fin. batten (planed) on to the lower edge of the drip-board (as at B in Fig. 43) at right angles, and giving the whole a good. Please note that these image

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