GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



403 



ENGINES, STAMPING ORES, IN SEPTEMBER 1834. 



Average 

 height 

 wliicli 

 every 

 head 

 lifts, in 

 inches. 



Number 

 of times 

 which 

 every 

 head 

 lifts, at 

 a stroke. 



Number 



of 

 strokes. 



Weight 

 of heads, 



and 

 lifters, in 



pounds. 



Pounds lifted 

 one foot high, 

 by consum- 

 ing a bushel 

 of coal. 



Num- 

 ber of 



strokes 

 per 



minute. 



ENGINEERS' NAMES. 



m 



^4 



689630 



12640 



19,613,077 



17,1 



Richards. 











24. .974 4nft 



18,4 



T?Tr'TTA'RTlS 





2 



867820 



9460 



12,043,378 



20,8 



RiCHARBS. 



101 



91 



682650 



12900 



25,082,720 



16,9 



J. ROWE. 



South engine and Devonshire's engine have been working vi^ith the cylinder 

 engine at Wheal Leisure. 



In reference to the quantity of water drawn by the Steam Engines from 

 the Mines, it should be observed, that some of the Engines deliver the 

 water to the Adit level, through double columns of Pumps ; others by 

 Sharamal Engines, that is, they deliver the water at a level beneath the 

 Adit, and from thence it is drawn by another Engine to the Adit level 

 There are other Steam Engines assisted by Hydrostratic Engines, in which 

 case the quantity of water cannot be correctly ascertained, and conse 

 quently the account is omitted. 



