GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



401 



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 



REMARKS, AND ENGINEERS' NAMES. 



319610 



feet 

 6,25 



20585 



39,865,618 



7,4 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



EusTis AND Son. 



183730 



7,5 

 6,5 



31863 

 2894 



49,480,822 



4,25 



Drawing perpendicularly 98 fathoms, 

 and the remainder diagonally. Main 

 beam over the cylinder ; one balance 

 bob at the surface ; and fathoms of 

 fiat rods under ground. 



229630 



7 



7914 



33,476,428 



5,3 



Drawing perpendicularly. Main beam 

 over the cylinder. 



Grose. 



193120 



6 



4993 



41,324,921 



4,78 



Drawing the load in three shafts per- 

 pendicularly, with main beam over the 

 cylinder and three bobs and 280 fath- 

 oms horizontal rods at the surface. 



J. ROWE. 



283000 



4 



7862 



40,453,563 



7 



Drawing perpendicularly 75 fathoms, 

 and diagonally 70 fathoms. Main 

 beam over the cylinder ; one balance 

 bob at the surface, and one under 

 ground ; and three angle bobs in the 

 shaft. 



F. MiCHELL. 



148140 



6 



5372 



33,158,670 



3,67 



Drawing diagonally, with main beam 

 over the cylinder, and one bob at the 

 surface. 



T. BOLITHO. 



I. — 3 A 



