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[engraved view of engines here]

ALLEY AND MACLELLAN'S COMPOUND DIAGONAL ENGINES.

DIMENSIONS OF COMPOUND DIAGONAL ENGINES, &C.


STEAMER                                   ONE BOILER                                 ENGINES
Builder's measurement = 222 tons     Diameter   .    .     = 11 ft. 6 in.     Diameter H.P. cyl.      = 22 in.
Length     .    .     = 140 feet.    Length     .    .     = 9 ft. 6 in.         "     L.P. cyl.      = 37 1/2 in.
Beam       .    .     =  18 feet.    Thickness of shell    = 13/16 in.        Length of Stroke        = 30 in.
Depth of hold   .     = 7 ft, 6 in.                                           No. of strokes per min. = 44
Speed .    .    .     = 14 1/2 kts.  Furnaces   .    .     = Two.             Cut off in each cyl.    = 15 in.
Weight of Engines     = 22 tons.     Tubes .    .    .     = 192              Indicated Horse-Power   = 300.
   "      Boilers in                   "  Diameter   .     = 3 1/4 in. O.D.   Diameter of Paddles     = 12 ft.
  working trim        = 23 tons.     Grate surface         = 33 sq. ft.       Breadth  .    .   .     = 6 ft.
                                     Total heating surface = 1298 sq. ft.     Immersion     .   .     = 2 ft. 3 in.
                                     Pressure   .    .     = 100 lbs.