. The book of the garden. Gardening. without the presence of lime, peroxide of iron, peroxide of manganese, or phosphate of lime, as the Garnkirk clay does, must be admitted to be the best. The floor of the fire-oven is formed of two fire-clay tiles, 18 inches broad and 2 feet long. The perforated tile a forms the grate upon which the fire burns, and the other the carbonising plate b, upon which fresh supplies of fuel are to be laid. These perforations, as shown in cross and longitudinal sections, figs. 336 and 337, are 1 inch in diameter upon the top surface, and 2 inches in diameter on the u
. The book of the garden. Gardening. without the presence of lime, peroxide of iron, peroxide of manganese, or phosphate of lime, as the Garnkirk clay does, must be admitted to be the best. The floor of the fire-oven is formed of two fire-clay tiles, 18 inches broad and 2 feet long. The perforated tile a forms the grate upon which the fire burns, and the other the carbonising plate b, upon which fresh supplies of fuel are to be laid. These perforations, as shown in cross and longitudinal sections, figs. 336 and 337, are 1 inch in diameter upon the top surface, and 2 inches in diameter on the under surface, for the admission of air to cause combustion. These tiles are each 4 inches thick. The sides of the oven are formed of four bricks, two on each side, 2 feet 3 inches long, 6 inches thick, and 12 inches broad. These are laid on their edge, and dovetailed together, as well as to the brick at the back of the furnace, which is of the same width and thickness as the side ones, but only 18 inches long; —they are rounded at the front edge, to ease the draught. The dovetailed bricks, wThich tie the others together, are 12 inches long, passing quite through the side bricks, 12 inches broad, and 16 inches thick at the tail end. The utility of these in binding the furnace together must be apparent. Fig. 336 is a cross section, showing the perforations in the grate a, the ends of the side brick b, and the roof or coverings. The roof is formed of one semi-cir- cular tile, 4 in- ches thick and 2 feet long, covering that part of the furnace which is over the grate, and also the throat of the flue, which are the parts most exposed to intense heat: it is bevelled off at the ends, so as to rest square on the side bricks. The roof over the carbonising plate is a flat tile 6 inches thick, 18 inches broad, and 2 feet long, contracting this part of the furnace to 12 inches by 18. Fig. 337 is a longitudinal section, show- ing the ash-pit door c, which is also of fire-clay, 3 inches th
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectgardening, bookyear18
