TRANSACTIONS OF SECTION G. 



889 



of the non-condensing engine of Oliver Evans and the multi-tubular boiler of 

 Nathan Read, and its development demonstrates that it has not been neglected in 

 the land of its nativity. 



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

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

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

 about as follows : — 



Price, with steel boiler, head-light included, #6,500, or say 1,343/.; per ton, 

 #154,89, equal to 321. ; per pound, 6.91 cents, equal to 3.43 pence. 



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

 which, 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-bolster, and radius bar. The ' Consolidation ' engine has eight 

 driving-wheels connected, with a single pair of pilot-wheels, swinging-bolster, 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 manufacturer. 



3. Pumping Machinery. By E. D. Leavitt, Jan. 



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

 possessing great historical interest, cannot for want of space be considered at this 

 time. 



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

 brought out his fire-engine, to be followed by the inventions of Savery, Newcomen, 

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

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

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



