GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



389 



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 busliel 

 of coal. 



Num- 

 ber of 



strokes 

 per 



minute 



EEMARKS, AND ENGINEERS' NAMES. 



390530 



feet 

 6 



11533 



38,827,435 



9,04 



Drawing diagonally. Main beam over 

 the cylinder, one balance bob at the 

 surface, and 100 fathoms dry rods, and 

 an angle bob under ground. 



F. MiCHELL. 



149830 



7,5 



66494 



41,100,643 



3,7 



Drawing perpendicularly 179 fathoms, 

 and the remainder diagonally. Main 

 beam over the cylinder; four balance 

 bobs under ground, and one at the 

 surface. 



Jeffree. 



115860 



5,5 



37846 



24,811,323 



2,87 



Drawing perpendicularly 110 fathoms, 

 and diagonally 24 fathoms. Main 

 beam over the cylinder ; five bobs and 

 70 fathoms of horizontal rods under 

 ground, and one balance bob at the 

 surface, Jeffree. 



92710 



7,75 



38400 



37,487,086 



2,3 



Drawing in two shafts perpendicu- 

 larly 63 fathoms, and the remainder 

 diagonally. Main beam over the cyl- 

 inder, and two bobs at the surface, 

 connected to 180 fathoms of horizon- 

 tal rods. 



James Sims. 



123640 



8 



30402 



53,891,086 



3,06 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



John West. 



218430 



7 



23654 



37,911,113 



5,4 



Drawing perpendicularly 110 fathoms, 

 and the remainder diagonally. Main 

 beam over the cylinder, and one ba- 

 lance bob at the surface, and an angle 

 bob under ground. 



John West. 



143730 



8 



34386 



48,276,432 



3,33 



Drawing perpendicularly, with main 

 beam over the cylinder. 



Gregor and Thomas. 



