206 [Assembly 



stood, the present cost and weight of apparatus, and of fuel for 

 the production of motive force, wouhl both appear so extrava- 

 gant, unscientific and wasteful, as Avas the use of steam for mo- 

 tive force, before the days of Watt ; yet, at that period, as at pre- 

 sent, engineers conceited they fully understood the subject, "o/"/ 

 attempted^ never reached^ 



Though it requires four times the force for double speed, it is 

 evident, that were the present enormous rate of fuel consumed 

 in steamers judiciously applied, it would furnish abundant 

 power for propelling them at much more than double speed, 

 while the consumption of fuel for the voyage would, of course, 

 be reduced to much less than one half. 



This increasing force obtained from decreasing quantities of 

 heat applied to steam apart from water, not only proves the pro- 

 digious economy of this means of obtaining motive force, but 

 points out the j^liysical cause of the superlative explosive force, 

 attendant on greatly and suddenly heated elastic fluids. 



Many other and valuable advantages incidentally occurred du- 

 ring the experiments, which are omitted, because enough is given 

 to stimulate the most torpid. We will, therefore, only add — 



The following advantages have been frequently verified by sev- 

 eral of the most eminent engineers and learned and competent 

 men of New-York and other places, by a condensing engine and 

 apparatus so constructed, when actuated alternately by common 

 steam and by moderately heated steam, and so that the compara- 

 tive quantities of heat and ot water actually employed for motive 

 force in each separate experiment could be accurately measured, 

 as well as the power exerted by the engine. 



The general results showed that more than six times the mo- 

 tive force was realized from equal quantities of heat and water, 

 when employed to actuate the engine with heated steam or 

 stame, tlian was obtained from the use of natural steam, each 

 being alilie produced from the same constant fire and time, and 

 same engine, which engine, apparatus and scientific instruments 

 are described in tliis work ; and testimonials of competent and 

 respectable engineers are open for inspection. 



