. Cassell's popular gardening. Gardening. 21(i CASSELL'S POPULAR GARDEXING. means of thin bent sli^DS of zinc or copper, fiimly secured to purlins, which may he either of wood alone, or wood resting on angle iron, as is shown in Fig. 38, where a represents the iron, b the fillet of wood, c the zinc or copper cli^, and d the glass. Fig. 39 shows a small portion of a roof glazed with 21 oz. glass. AAA, The top, mid- dle, and hottom hars, are made in 3 ft. lengths, of either zinc or copper, and are fixed with brass screws to purlins or bearers. The bars are so constructed that all condensed
. Cassell's popular gardening. Gardening. 21(i CASSELL'S POPULAR GARDEXING. means of thin bent sli^DS of zinc or copper, fiimly secured to purlins, which may he either of wood alone, or wood resting on angle iron, as is shown in Fig. 38, where a represents the iron, b the fillet of wood, c the zinc or copper cli^, and d the glass. Fig. 39 shows a small portion of a roof glazed with 21 oz. glass. AAA, The top, mid- dle, and hottom hars, are made in 3 ft. lengths, of either zinc or copper, and are fixed with brass screws to purlins or bearers. The bars are so constructed that all condensed steam or va- pour passes to the out- side through the holes marked a, on to the pane of glass below. The top portion of the centre and bottom bars form a series of clips and slots ; the latter al- low a free pas- sage of water, and the clips secure the glass in posi- tion. B, Purlins or bearers to which the ho- rizontal metal bars are fixed. These purlins are two inches "m depth and thickness, more or less, according to the distance the rafters are apart. AVhen the latter are more than four feet apart, 2 in. x 1 in. X ^ in, angle-iron, with a fillet of wood fixed inside (see Fig. 38) for screwing the bar to, will bear 6 ft.; 2 in. X 1| in. x | in. will bear about 8 ft., which dis- tance it is not advisable to exceed. Rafters made 4 ft. apart do not require angle-iron purlins. The purlins are best placed from 24 in. to 30 in. apart if ^ glass is used, and up to 36 in. apart if ^^y- glass is adopted. When 21 oz, glass, which is the best weight for all ordinary horticultural purposes, is used, the distance should not exceed 24 Fig. 40.—INDE3TRTJCTIBLE Wall-tree Peotectoi;.. 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 Fish, David Taylor, 1824-1901; Fish, D. T. (David Taylor), 1824-1901. London ;
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Keywords: ., bookcentury1800, bookdecade18, booksubjectgardening, bookyear1884
