. The book of the garden. Gardening. RAFTERS AND ASTRAGALS. 547 r Fig. Fig. 777. down by a button, c, screwed to the top and bottom ends of each rafter; d is the glass sash, e the felt shutter. By such simple protection we 1 keep heaths, New Holland plants, &c, 2} through the winter, without the aid of fire-heat or any other covering whatever. It will readily be seen that, when the asphalt shutters are placed over the glass roof, a space of about two inches is left between them ; and as this space is filled with air, which is one of the best non-conductors of cold, the keenest frosts
. The book of the garden. Gardening. RAFTERS AND ASTRAGALS. 547 r Fig. Fig. 777. down by a button, c, screwed to the top and bottom ends of each rafter; d is the glass sash, e the felt shutter. By such simple protection we 1 keep heaths, New Holland plants, &c, 2} through the winter, without the aid of fire-heat or any other covering whatever. It will readily be seen that, when the asphalt shutters are placed over the glass roof, a space of about two inches is left between them ; and as this space is filled with air, which is one of the best non-conductors of cold, the keenest frosts we have are resisted, as well as the glass preserved. The cast-iron astragals we have in use at Dalkeith are upon two small houses, having a northern aspect—the one span- roofed, and the other in the lean-to form. They are both without raf- ters, and are represented of full size by the annexed sketch, fig. 777. We had them cast some years ago for a different purpose. They are very well cast— having been cast vertically instead of horizontally, as all such castings should be : the cost, however, was nearly ten times that of the wooden ones we had made for the purpose the others were in- tended for. Most of the wooden astragals in the houses here, having framed lights and rafters, are of the same pat- tern, only a quarter of an inch deeper. Figs. 778 and 779 are sections of astragals used by us in various houses, erected in different parts of Britain, without rafters. Fig. 778 is grooved on both sides—the one groove being deeper than the other, for reasons already given; while 779 is rebated in the usual manner—the dotted lines showing the surface of the putty. The copper sash-bar or astragal in common use is represented by fig. 780,. 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 McIntosh, Charles,
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
