Start Edating 21220

Edating 21220

H = the number of degrees the bar is heated above 32^ Fahr. A continuance of decomposition changes the lignite into bitumuious or common coal, chiefly by the discharge of carburetted s. It will be seen from the foregoing Table that the quantity of oxygen decreases rapidly during the process of fossilization of the vegetable matter, and that the constituents of coal are chiefly carbon and hydrogen, which are united and solid. 82-9 5'30 5'24 126 1-30 4'0 126 Ditto, Good Ordinary. Hard wood makes better charcoal for fuel than soft wood. It is moulded under pressure into blocks, and baked at a high temperature. Coke-dust Briquettes, or block-coke, are generally composed of washed coke-dust 100 pounds, pitch 7 pounds, tar 2^ pounds. Wood, on an average, contains approximately i pound of hydrogen for each 8 pounds of oxygen, and, as the hydrogen is thus neutralized by the oxygen, it develops no heat. — ^A cord of wood can be burnt per hour on 60 square feet of fire-grate surface. The gas-companies undertake to supply gas of 16 candle-power, or gas giving a light equal to that of 16 sperm-candles burning 120 grains of sperm per hour, the consumption of gas being 5 cubic feet per hour through an approved burner. To prevent the production of smoke it is necessary to burn the oil with a large supply of air in a furnace so arranged as to accumulate heat, or in a muffle-like, brick-lined chamber. This acid, necessarily at a very high temperature, passing upwards through the body of incandescent solid matter, takes up an addi- AIR REQUIRED TO SUPPORT COMBUSTION. 21000 20153 19200 17752 19950 19680 19534 19505 18990 18840 18738 18546 18315 1812O 17950 I787I 17388 14490 16974 16596 15865 I5213 15000 14945 14826 13428 I4168 14000 13963 13876 13762 '3524 13300 ^3493 12800 14302 1 304 1 12800 12558 10626 6762 14544 14500 14040 Evapora- tive Power I in lbs. (Favre and Silbermann) Flax-Refuse Averages Ramie-Refuse Straw Dry Ditto . of Water evapofaied' to Steam, i from and at; ata'Fahr.' i3'36 13*66 1277 I2'00 1077 9-00 812 IQ-QO 9-83 7-50 778 7-50 7-13 684 676 671 6-66 662 5*oo 657 6*50 5'oo 3-13 6' 1 2 5-40 4'I0 5-17 5-08 463 4*47 4*61 2-58 4*84 4*17 425 4-12 4'00 3'oo 3'8o 2'00 FIRING STEAM-BOILERS. To effect the efficient distribution of heat in water, it is necessary to have free circulation. — ^The preceding calculations show ithat the production of steam varies considerably in different types of boilers. tt tt mean maximum tt It tt » » ' Internally fired cylindrical multitubular boilers . IIS Pounds of water evaporated per square foot of fire- grate surface per hour. the Combus- tion utilised Temperature in Degrees Fahr. of water-tube boilers, number of bricks required for, 299.