360 EXPLANATION OF THE PLATES. 



shaft connected with the hot water cistern and cylinder casing, the ribs or webs of 

 which are disposed in the direction of the strain : there are many more fanciful and 

 pleasing forms, but certainly none so mechanical or so well adapted to the purpose. 

 T, Injection pipe through side of vessel, g, bilge injection. To be used in the event 

 of the vessel leaking to any extent, in which case the river injection would be shut 

 off, and the bilge one opened. This is an appendage which has till lately been over- 

 looked by other makers, but a very necessary one, as by such means about four 

 gallons per horse power per minute might be withdrawn by injecting from the 

 vessel. 



U is a longitudinal section of the boiler ; V, the grate ; and W, the flues ; y, safety 

 valves enclosed in safety pipe, and perfectly inaccessible to the engine-man for the 

 purpose of applying extra weight to endanger the boiler. This description of valve 

 was used by them as far back as 1814, in a vessel fitted on the Tyne, consequently 

 three years previous to the examination before the Committee of the House of Com- 

 mons for some such precaution, h k, Blow-out pipes and cocks ; i i i, feed pipes ; It k, 

 &c., hold-down bolts, occasionally cased with brass to prevent corrosion. 



PLATE XXXII. 



This plate represents, with similar reference letters, a transverse section of the same 

 splendid steamers, the Red Rover and City of Canterbury, shewing on the left the 

 cylinder, and on the right the crank end of the engine, with the paddle wheels, main 

 beams for support of paddles, stays, &c., &c. 



