740 lieport on the Trials of Iiiqylemcnts at Bedford, 



Experiments -were made witli a 10-horse-power portable engine, workins; on 

 the dynamometer brake at 20-horse-power, and the steam was kept up to 

 70 lbs. per square inch. One hundredweight (112 lbs.) of straw was weighed 

 out and consumed in 14 minutes, giving a result of 23 lbs. per horse-power per 

 hour, and as these engines would consume about 5j to 6 lbs. of coal per horse- 

 power per hour, it follows that it requires from 3f to 4 lbs. of straw to produce 

 the same result as 1 lb. of coal. 



Fig. 60. — Elevatiun of Messrs. Clayton and Sliuttlewortli s Governors for 

 Variable Exjyansion Gear, No. 5066. 



ELEVATION 



The actual amount of straw consumed varies considerably according to 

 quality, but it may be taken as an average that it requires from 8 to 9 sheaves 

 of straw to thresh 100 sheaves of \vheat of the same size. 



In Egypt, where wood does not exist and all the coal has to be imported, 

 these engines are coming into use for burning cotton-stalks, which may be 



