EXPLANATION OF THE PLATES. 363 



1 1, Blow valves. 



K K, Hot water cistern. 



L L, Feed pumps, dotted. 



M, Condenser. 



N, Handle of injection cock. 



oooo, Holding down bolts, dotted. 



PLATES XXXVII., XXXVIIL, AND XXXIX. 



ENGINES OF HER MAJESTY'S STEAM FRIGATE PHCENIX. 



These three plates represent a plan, side elevation, and transverse section of the 

 steam engine of her Majesty's steam frigate Phoenix ; they also describe the engines 

 of the Medea, Rhadamanthe, and Salamander, the machinery of these four vessels 

 being identical, and all manufactured by Messrs. Maudslay, Sons, and Field. Plate 

 XXIII. gives a more detailed representation of the boilers of these vessels, and may be 

 referred to for additional information. 



The general arrangement of these engines is on the ordinary side beam construc- 

 tion ; all the working part, except the beam, of wrought iron ; metallic piston ; and the 

 crank pins are so arranged that the wheels may be readily disconnected for sailing. 



The boilers are of iron, in two independent parts, and furnished with valves so 

 contrived that they may be used either separately or both together. 



The wheels are of the ordinary construction, except those of the Medea, which are 

 Morgan's; some of the others have had cycloidal boards applied to the original 

 wheels. 



The proportions of these engines are as follows : 

 The nominal power is . . . 110 each, or 220 H. P. collectively. 



Diameter of cylinder 55^ inches. 



Length of stroke 5 feet. 



Diameter of wheels 21 feet. 8ft. 6 in. wide. 



The Medea, Morgan's . . . . 24 feet. 5 ft. 8 in. 

 Length of engine room . . . . 58 feet. 



The tonnage of the Phoenix, Rhadamanthe, and Salamander is about 800 tons; that 

 of the Medea being 807 tons. They carry two heavy traversing guns, 10 calibre, 

 which throw an 84 pound shot ; one of these guns is placed in the bow and one at 

 the stern; below they carry four 18 pounder carronades, with provisions for 120 men. 

 They can stow from 200 to 300 tons of coal at a draught of water of 14 feet. 



The consumption of coal being 15 tons per day, they can steam from 15 to 20 

 days. 



The scale of the drawings is of an inch to the foot. 



