TRANSACTIONS OF SECTION O. 



487 



to the great majority of them being published or obtainable, these form the best 

 available data on which to judge the working results obtained with different 

 types of plant. 



The author agreed that the conditions of working in some factories differ con- 

 siderably from those of an electricity supply-station, but claimed that loss of 

 efficiency is largely brought about by causes which are common to all places, and 

 that consequently deductions from electricity-station figures are applicable to the 

 great majority of power cases. 



Stations having a plant capacity exceeding 1,000 h.p., were excluded from 

 the main comparisons for reasons stated in the paper. 



The following table gives a comparison cf results of the different types cf 

 plant in stations where the plant capacity does not exceed 1,000 h.p. 



Table I. 

 Average Cost per B.T.U. S»ld. 



The great saving shown by these figures has been repeatedly confirmed by the 

 experience of the writer, even in cases where the guarantee figures with the Diesel 

 plant have not equalled the figures guaranteed and obtained on test with the 

 previous plants. 



A table was given showing the average results obtained from steam stations 

 of various sizes, these averages, like those given in Table I., being deduced 

 from the tables published in the 'Electrical Times' combined with information 

 obtained direct from station engineers. 



Table IT. 

 Average Works Costs per B.T.U. Sold, on Steam Stations of Different Sizes. 



Constructional features were then dealt with and reasons given in favour of 

 the multi-crank vertical engine, particularly for dynamo driving. For high- 

 speed engines forced lubrication and very complete enclosing were strongly 

 advised. 



The development of the Diesel cycle from the Carnot cycle was then briefly 



