323 



will enable us to reduce the fuel wasted during inaction, to 

 from 15 to 20 per cent, of the amount of fuel usefully em- 

 ployed. And I will now remark that all other systems of 

 locomotion, by stationary power, are subject to the like loss 

 of fuel during the period the engine is inactive, as occurs in 

 the Atmospheric system, as hitherto applied; indeed, more 

 so, for on the Atmospheric system the power is accumulated 

 during the production of the prior exhaustion, but the rope 

 system does not admit of any accumulation. The locomotive 

 engine must also be charged with some loss of fuel during 

 inaction; but this will perhaps not exceed 10 per cent., as the 

 fuel does not consume very rapidly, when not urged by the 

 blast pipe. 



The account of fuel and power between the locomotive 

 and the atmospheric system, will, therefore, stand as follows, 

 each system being supposed to carry loads of 75 tons, or 

 about 15 passenger carriages on a level, and two trains per 

 hour : — 



ON THE LOCOMOTIVE. 



200 of money, represents 100 



The loss by locomotive equals the power usefully 

 employed 50 



Power usefully employed 50 



ON THE ATMOSPHERIC AS HITHERTO USED, THE TRAFFIC 

 BEING TWO TRAINS PER HOUR. 



200 of money, represents 100 loss during interval, 

 and 100 of power generated 100.0 



Losses by friction of engine, by air pump, heat of 

 air, leakage, friction of air, and travelling piston 47.5 



Power usefully employed 52.5 



ON MY SYSTEM. 



240 of money, (after deducting 20 per 



cent, for lost fuel,) represents 200 of power. 



Losses at 47.5 per cent, as before 95 



Power usefully employed - , = . 1 05 



