TR.\NgACTIONS OF SECTION G. 



889 



of the non-condensing engine of Oliver I'^vans and the multi-tubular boiler of 

 Xathan liead, and its development demonstrates that it has not been nef^lected in 

 the laud of its nativity. 



With a few words about prices now current, this paper is Ijroupht to a close. 

 The weight of our ordinary Americtin locomotive, with cylinder 17 inches dia- 

 meter, and 24 inches stroke, four drivinj^-wheels connected, 5 feet diameter, is 

 about as follows : — 



Price, with steel boiler, head-light included, ,!?('),r)()0, or .say l.-'t.'}/. ; per ton,. 

 ,'>'i.j4,8f», equal to '^21. ; per pound, G.91 cent.s, (-(jual to .^.4."J pence. 



Engines of various sizes and styles may be bought about at prices subjoined, 

 \fbicli, it must be said, are about the actual cost. 



The ' Mogul ' engine has six driving-wheels connected, with a single pair of pilot- 

 wheels, swinging-))ol,ster, and radius liar. The ' Consolidation ' engines has eight 

 liriving-wheels connected, with a single pair of pilot-wheels, swinging-l)olster, and 

 radius bar. In both, a part of the weight otherwise carried by the pilot-wheels 

 is transferred to the driving-wheels by equalising levers. 



The prices above given are certainly too low, as they afford no satisfactory 

 profit to the mnnufact'.rer. 



3. Fiuuping Machinery. Ihj E. D. Leavht, Jan. 



The appliances known and used by the ancients lor raising water, while 

 possessing great historical interest, caimot for want of space be considered at thia 

 lime. 



It waa not until the seventeenth century, when the Marquis of Worcester 

 ''roujrht out his fire-engine, to be followed by 'the inventions of Savery, Xewcomen, 

 Papin, and many others, that pumping machinery assumed a decided importance. 

 lis greatest development has occurred during the present century, and must be 

 "edited to the improvement in the steam-engine made by James Watts. 



