DESCKIPTION OF PLATES.
377
bow, and was built by tbe Thames Iron Works and Ship-building Company; it is 2,811 tons, builders’ measure-ment, and is 220 feet long between perpendiculars, and53 feet wide, with a draught of water of 14 feet 6 inches.
Plates 3 to 8 inclusive. —These illustrate the ar-rangement and details of Mr. Spencer’s patent auxiliarysurface condensers and engines for the iron screwsteam-ship “ Frankfort,” of Liverpool. The type of theengine is vortical, inverted direct action. The con-densers are tubular, with outside condensation; thepumps being on the combined principle, similar to thoseadopted by Messrs. Penn in H.M.S. “ Aretliusa.” Themotion is derived from the steam piston-rods for thepumps, and the arrangements and form of the valves canbo understood from the drawings. The cylinders ar6fitted with the ordinary slide valves and expansion valvesat the back of the same.
The following particulars will render the. several por-tions to bo understood without further notice ;—
Diameter of Cylinders . 20”
Length of Stroke of Piston . 15”
Diameter of Combined Pumps. 14”
Length of Stroke . .. 15"
Diameter of Feed Pumps .. . 3Y'
Length of Stroke of ditto.. .. 15”
No. of Tubes in Condenser . 584
Length of ditto.5' 6”
External diameter of Tubes . 11”
Thickness of ditto, 18 wire gauge.
Amount of Cooling Surface (sep feet), 1,004.
Plates 9 to 14 inclusive.—A description of theseengines, constructed by Messrs. Dudgeon, will be foundin pages 71 to 73, inclusive. The “condensers’ aredescribed in page 259; also the “ cylinders ” in page277; the “ slide valve ” in page 286 ; the “ piston ” inpage 278, and the “ link motion ” in page 292 ; to whichthe following particulars, supplied by the firm, are nowadded:—
Nominal Horse-power Collectively. 350
Actual „ Indicated .1540
Diameter of Cylinders .. .. Inner, 27” ; Outer, 62”
Length of Stroke .2' 0"
Width of Exhaust Steam Ports in Cylinders, 6f” and 4”„ „ „ Yalve .. .. 3i”
„ Supply Ports in Cylinders .. .. 4” and 2”
,, Small Bar in Cylinders. IV’
Width of Large Bar in Cylinders ., ..
Length of Steam Ports .2' 6 1
Outside Lap of Valve
Width of Steam Opening caused by Valve
Diameter of Valve Bod .
Length of Link between Centres of EccentricBods .. .. .
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31”
Thickness of Cylinders ..Diameter of Piston Bods ..
Depth of PistonDiameter of Crank Shaft ..Length of Bearings .. ..
Diameter of Connecting BodLength of „ „
. 1 ' 6 ”
Inner 1)" ; Outer 1-fe"
Inner Cylinder
(1) 3|”; Outer (2) 4> "
. 8 ”
.. .. (bearing) 9-f"
.18i”
05 "
. v s
.4' 0”
„ Suction Valves’ Openings. 4|”
„ Discharge „ „ . 4|”
Number of Suction Valves (ditto for each condenser) 18
„ Discharge „ .(ditto) 18
Diameter of Circulating Pump . 11”
„ Suction Valves Openings .. .. As above.
„ Discharge „ „ .... Ditto.
Number of Suction „ „ .... Ditto.
„ Discharge „ „ .... Ditto.
Thickness of Metal of Condenser.
Number of Tubes in Condenser .
Diameter of Tubes (External). f 1 "
Length of Tubes . 5'101"
Diameter of Feed Pumps. 3i”
„ Injection Pipe (Surface Condenser,with additional Jot Injection 3” diameter.)
n"
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2017
„ Feed
. 3"
„ Bilge Injection Cocks ..
. .. .. 3"
„ Cylinder Belief Valves
. 4”
„ Main Discharge Pipe ..
„ Exhaust Steam.
„ Single Supply .
„ Main Supply
.16”
. Gun Metal.
„ Feed Plunger
. Ditto.
Feed Pump ..
.. Single Acting.
Distance between Centres of Cylinders
.. 5’ 6”
Diameter of Screw Propeller ..
10' 6”
Length on Line of Keel
.. 3' 0”
Pitch. .
18' 0”
Kind of PropellerNumber of Blades
, Common.
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3 i