GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



391 



STEAM ENGINES, IN SEPTEMBER 1834. 



Number 



of 

 strokes. 



Lgth 

 of the 

 stroke 

 in the 

 pump. 



Load, in 

 pounds. 



Pounds lifted 

 one foot high, 

 by consum- 

 ing a bushel 

 of coal. 



Num- 

 ber of 



strokes 

 per 



minute 



KEMARKS, AND ENGINEERS' NAMES. 



265360 



feet 

 7,5 



7 



25090 

 4160 



39,575,429 



6,14 



Drawing the load in two shafts per- 

 pendicularly. Main beam over the 

 cylinder; 215 fathoms of horizontal 

 rods, connected by two bobs at the 

 surface, and 70 fathoms of dry rods in 

 the shaft. 



Geegor and Thomas. 



507570 



5,25 



8147 



36,364,584 



11,4 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



Gregor and Thomas. 













Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



Etjstis. 



306130 



8 



70701 



78,348,224 



6,84 











iDrawinff perpendicularly. Main beam 



235640 



8 



40292 



64,808,238 



5,28 



over the cylinder, and one bob at the 

 surface. 



Grose. 





7 



16956 







Drawing the load perpendicularly 18 

 fathoms, and diagonally 101 fathoms. 

 Main beam over the cylinder; one 

 balance bob at the surface. 



Etjstis and Son. 



154710 



7,5 

 4 



13958 

 3600 



27,053,803 



3,7 



Drawing perpendicularly 28 fathoms, 

 and the remainder diagonally. Main 

 beam over the cylinder; three bobs and 

 130 fathoms of horizontal rods at the 

 surface, and 180 fathoms of dry rods 

 in the shaft. 



EusTis AND Son. 



272150 



7,75 



87329 



68,143,193 



6,5 



Drawing all the load perpendicularly. 

 Main beam over the cylinder; two ba- 

 lance bobs at the surface, two ditto 

 under ground, and a balance lift in 

 the shaft. 



Hocking and Loam. 



I 



