. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. holevel of the fires consist of two distinct shells, not bondedtogether; tho inner one, a, a, of firebrick, 9 inches thickand 12 feet high above tho fnvs; and the outer ono ofcommon briek, 8 inches thick. In one of tho long siilrs anopening of about 4 8 wide is left for charging and empty-ing the kiln, licforo tho baking is commenced this open-ing is closed with old firebrick put in close-jointed, but dry,its outer surface only being coated over with a layer of fire-clay mortar. An air-space, 2 inche
. Johnson's new universal cyclopaedia : a scientific and popular treasury of useful knowledge. holevel of the fires consist of two distinct shells, not bondedtogether; tho inner one, a, a, of firebrick, 9 inches thickand 12 feet high above tho fnvs; and the outer ono ofcommon briek, 8 inches thick. In one of tho long siilrs anopening of about 4 8 wide is left for charging and empty-ing the kiln, licforo tho baking is commenced this open-ing is closed with old firebrick put in close-jointed, but dry,its outer surface only being coated over with a layer of fire-clay mortar. An air-space, 2 inches wide at bottom, isleft between the inner and outer walls, but the walls nrogradually drawn together, so that they touch eaeh other attop. The side-walls and end-walls of tho outer shellare not bonded together at the corners, and do not ovcrlupeach other. Tho iirebriek lining is therefore exposed toview at these points. The outer wall is built with a groove/,/ about 2 inches deep and .1^ inches high, Mben thoinner wall begins to expand by the efiect of the heat, tho r Fio. 8. li^,^HW/fWMt. a,. Scctlonnl plnn, on line A, B, C, D, E, F.
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Keywords: ., bookcentury1800, bookdecade1880, bookidjohnsonsnewu, bookyear1881
