359> 
Steam Engine, 
engine in work, however clearly expressed in quantity 
per day, would be fairly shewn, unless the wages or food 
of the working being were taken into the account. Coals 
may be stiled the food of a steam engine, and nothing is 
more evident than that, if two engines raise equal quanti- 
ties of water per hour, but consume different quantities of 
coal, they will not be equally beneficial to the proprietors. 
I would therefore propose, that the estimate should be 
made by attending to these two particulars only, and say- 
ing nothing about horses, at least in specific arguments 
intended to have legal effects : And, as a supplement to 
the facts and observations contained in the report, I will 
add, that one of the best engines of Boulton and Watt, 
has been known to raise between 28 and 30 millions of 
pounds of water, to the height of one foot with one bushel 
of good coals, which appears to be an outside measure ; 
and that, though there are subsequent improvements both 
in the construction of furnaces and the working gear, yet 
there are some among late engines which fall short of 2Q 
millions. 
I am, Sir, 
Your constant reader, 
E. T. 
Report concerning the power of a Steam Engine erected 
by contract at ^ ^ ^ 
IT is required to determine whether the steam engine 
erected at ^ ^ ^ ^ by Mr. — — be equal to the power 
of sixteen horses. The same has a cylinder of 2\\ inches 
diameter, and gives 23 double strokes per minute, of four 
feet each. 
In answer to this question it must be previously re- 
marked, that steam engines having originally been recom- 
mended and substituted instead of horses, the method of 
computing by the number of those animals intended to 
be supplied by means of this invcutioiij has been genera!- 
