+----------------------------+-------+--------+--------+-----------+---------+---------+----------------+----------+---------+------+ | | | | | | Air | |Water Evaporated| Water | | | | | | | | Coal |Pressure |Chimney |per lb. of Coal.| Evapor- | Thermal |Effic-| | | Grate |Heating |Duration| burned |in Stoke-|Draught--+-------+--------+ated per |Units per|iency | | Description of Boiler. | Area |Surface |of Trial|Per sq. ft.| hold-- |Inches of| |From and|sq. ft. of| lb. of | of | | |sq. ft.|sq. ft. | Hours. | of Grate |Inches of| Water |Actual | at 212 | Heating | coal. |Boiler| | | | | | per Hour. | Water. | | | deg. F.| Surface. | | %. | +----------------------------+-------+--------+--------+-----------+---------+---------+-------+--------+----------+---------+------+ |Ordinary cylindrical single-| 81 | 2308 | 25 | 14.2 | Nil | 0.36 | 8.56 | 10.26 | 4.26 | 14,267 | 69.7 | | ended; 3 furnaces; 155 lb. | " | " | 24 | 13.9 | " | 0.50 | 8.84 | 10.33 | 4.32 | 14,697 | 68.0 | | working pressure; closed | " | " | 9 | 30.3 | 0.81 | 0.39 | 7.93 | 9.27 | 8.46 | 14,686 | 61.4 | | stokehold system.[1] | " | " | 8-1/2| 29.1 | 0.65 | 0.32 | 8.84 | 10.34 | 9.05 | 14,612 | 68.4 | +----------------------------+-------+--------+--------+-----------+---------+---------+-------+--------+----------+---------+------+ |Ordinary cylindrical single-| |2876 in | | | | | | | | | | | ended; 3 furnaces; 210 lb. | |boiler, | | | In Ash- | | | | | | | | working pressure; closed | 63.2 |766 in | 13 | 20.6 | pit | 0.58 | 11.30 | 12.33 | 5.14 | 14,475 | 82.3 | | ashpit, Howden system.[2] | | air | | | 1.53 | | | | | | | | | |heaters | | | | | | | | | | +----------------------------+-------+--------+--------+-----------+---------+---------+-------+--------+----------+---------+------+ |Niclausse water-tube; 160 | 46 | 1322 | 8 | 12.8 | Nil | 0.20 | 8.41 | 10.15 | 3.75 | 14,680 | 66.9 | | lb. working pressure. | " | " | 8 | 21.9 | " | 0.20 | 8.01 | 9.40 | 6.11 | 14,760 | 62.1 | | | " | " | 37 | 20.2 | " | 0.29 | 7.62 | 9.00 | 5.44 | 14,600 | 60.5 |