84 APPENDIX. 



DIMENSIONS OF H. M. STEAM FRIGATE MEDEA. 



Feet. Inches. 



Length extreme 206 



,, between perpendiculars ...... 



,, of keel for tonnage ...... . . 157 OJ 



Breadth extreme over paddle boxes . 46 



,, inside ,, ,, . . 31 11 



,, ,, including sponsons ........ 42 



Burthen, old measurement, 835 tons. 

 new 807 . 



Breadth of engine room, including boilers, but exclusive of coal bunkers . . 22 

 Length of engine room, including boilers . . . . . . . . 61 9 



Quantity of coals stowed in the bunkers within this length . 200 tons. 

 ,, ,, in coal room forward . . 35 ,, 



,, ,, ,, aft . . . . 40 ,, 



bags on orlop docks . . . . 45 ,, 



With the armament complete, 320 tons of coal, 18 tons of water, and three 



months' provisions for 120 men, the immersion is, forward . . . . 13 10 



abaft . . 14 6 



The upper part of the boilers are then above water line . . . . .26 



The upper part of the steam chest is ..69 



The centre of paddle shaft is ,, 67 



The summit of the water in boilers is 09 



The dip of the paddle floats with the above immersion is .... 5 8 



THE ENGINES AND BOILERS. 

 Power, 220 horse. 

 Diameter of cylinder ... ..... 4 6 



Length of stroke 50 



Diameter of the wheels 24 6 



Length of the paddle boards ... ... . . 5 7J 



Breadth ,, ,, ..... -...46 



Minor diameter of elliptical funnel ......... 4 



Length of funnel above the deck 32 



Weight of the engines 165 tons. 



>t boilers ...... . . 35 ,, 



water required in boilers 45 



good water distilled daily from cylinder jackets or casings . 4 ,, 

 Maximum number of revolutions made by the engines per minute, 22. 

 Average consumption of good coal for each horse power per hour, 8 Ibs. * 



per day, working at full power, 18 tons 17 cwt. 



Number of days' coal carried in the vessel, with the armament on board, supposing her work- 

 ing at full power the whole time, 17. 



1 With the best coal 7 Ib. per horse power each hour, was sufficient. 



