EXPLANATION OF THE PLATES. 477 



of her midship section 63.2 feet ; under these circumstances her speed through the 

 water has been ascertained by careful trials to be 13.5 miles per hour, no other 

 vessel having yet exceeded the rate of 12.7- 



PLATES C. TO GUI. 



DESCRIPTION OF HER MAJESTY'S STEAM VESSEL OF WAR MEDEA, CON- 

 STRUCTED AND BUILT BY OLIVER LANG, ESQ., MASTER SHIPWRIGHT, 

 ROYAL DOCK YARD WOOLWICH; 



Shewing the mode of putting her frame together so as to obtain and produce the 

 greatest combination of strength in connecting the various parts of the ship, and dis- 

 tributing the fastenings equally throughout the fabric. 



Light. Deep. 



Feet. In. Feet. In. 



, f afore 70 13 10 



Draught of water < ... 



(.abaft 91 14 6 



Displacement in tons ...... 502'81 1230 



Area of midship section 168'84 354 



The keel was made secure on his principle of the " safety keels ;" the inner or 

 solid one, fitted to the floor timbers in midships, and to the deadwood afore and 

 abaft, with dowels on the upper or faying part, connecting the floors, deadwood and 

 keel together ; the under side of the keel projecting a few inches only beyond the 

 bottom, protected by a longitudinal piece of timber, fitted all fore and aft on each side, 

 substituting the chocks usually brought on the heels of the timbers, to fashion them 

 at that place, and of sufficient size not only to make good the said chocks, but like- 

 wise the plank of the bottom (commonly called the garboard) in one solid substance ; 

 those pieces are placed one on each side of the inner keel, with felt between the 

 faying surfaces, dowelled and connected together by bolts, driven athwartships 

 through all and clenched on a ring at the outer sides of the longitudinal pieces, and 

 likewise in an up and down direction, through the frame timbers, similarly clenched ; 

 the inner or solid keel as before described, is previously dowelled and bolted in a ver- 

 tical direction through the floors, deadwood and keelson, in addition to those lon- 

 gitudinal pieces or side keels, the ends of the bolts being well clenched on rings, thus 



