-----------+----------------------------------- | _Weight of Coal._ | Min. Max. Aver. -----------+----------------------------------- One Chal. }| of Coal, }| 2,800 to 3,136 -- 2,968 from 25 to}| 28 cwt. }| One Ton | 2,240 One Sack | 233 to 261 -- 247 One Bushel | 78 to 87 -- 82½ One Peck | 19½ to 21¼ -- 20¼ One Pound | 1 -----------+----------------------------------- -----------+-------------------------------- |_Produce of Gas, in cubic feet._ | Min. Max. Aver. -----------+-------------------------------- One Chal. }| of Coal, }| 8,906 to 11,872 10,388[39] from 25 to}| 28 cwt. }| One Ton | 6,720 to 8,960 -- 7,840 One Sack | 741 to 988 -- 814 One Bushel | 247 to 330 -- 290 One Peck | 61 to 82 -- 71½ One Pound | 3 to 4 -- 3½ -----------+-------------------------------- -----------+----------------------------------------- | } |_Candles._ | } |9,516 11 to the pound. One Chal. }| }[39]Equal to |8,651 10 do. of Coal, }| }as many tallow |7,786 9 do. from 25 to}| }candles, 12 in |6,921 8 do. 28 cwt. }| }the pound, |6,556 7 do. | }burning two |5,194 6 do. One Ton | }hours; or to |4,325 5 do. One Sack | } |3,463 4 do. One Bushel | } |2,595 3 do. One Peck | } |1,730 2 do. One Pound | } | 866 1 do. -----------+----------------------------------------- COKE.--One chaldron of coal, from 25 to 28 cwt. gives 1¼ to 1½ chaldron of Coke. TAR.--One chaldron of coal, from 25 to 28 cwt. gives from 150 to 180lb. of Tar,[39] or 15 to 18 ale gallons, 10lb. each. AMMONIACAL LIQUOR.--One chaldron of coal, gives from 220 to 240lb. of Ammoniacal Liquor, or 22 to 24 ale gallons. [39] 1000lb. of Coal-Tar afford by distillation, from 260 to 265lb. of Essential Oil, or Naphtha. 1000lb. of Coal-Tar produce by mere evaporation, from 460 to 480lb. of Pitch. _Tabular View, exhibiting the illuminating power of Coal-Gas, compared with the illuminating power of Tallow Candles of different sizes._