GEOLOGICAL SOCIETY OF PEIiNSYLVANI A. 387 



1 



STEAM ENGINES, IN SEPTEMBER 1834. 



Number 



of 

 strokes. 



Lgth 

 of the 

 stroke 

 in the 

 pump. 



Load, in 

 pounds. 



Pounds lifter 

 one foot high, 

 by consum- 

 ing a bushel 

 of coal. 



Num- 

 ber of 



strokes 

 per 



minute 



EEMARKS, AND ENGINEERS' NAMES. 



146970 



feet 



5,75 

 6,25 



14686 

 2476 





3,5 



Drawing the load in three shafts 65 

 fms. perpendicularly, and the remain- 

 der diagonally. Main beam over the 

 cylinder, two bobs and 40 fms. of hori- 

 zontal rods at the sm-face, and two V- 

 bobs and 40 fms. of horizontal rods un- 

 derground. Sims and Son. 





7 



69114 







Drawing perpendicularly, with main 

 beam over the cylinder ; one balance 

 bob at the surface, and one ditto un- 

 der ground. 



Sims and Son. 



153520 



7,25 

 6,25 



27322 

 3445 



41,521,440 



3,8 



Drawing the load in two shafts per- 

 pendicularly 17 fathoms, and the re- 

 mainder diagonally. Main beam over 

 the cylinder; two bobs and 164 fathoms 

 horizontal rods at the surface, 47 fa- 

 thoms under ground, and 4 shieves and 

 110 fathoms dry rods in the shafts. 



Sims and Son. 



65670 



6 



16780 



24,307,557 



1,63 



Drawing the load in two shafts per- 

 pendicularly, with main beam over 

 the cylinder, and two bobs and 112 

 fathoms horizontal rods at the surface. 



Sims and Son. 



177380 



7 1 



42953 



47,030,883 



4,1 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



Sims and Son. 



129360 



7,5 



40447 



40,791,766 



2,96 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



F. MiCHELL, 



234960 



7,5 



48886 



52,592,740 



5,43 



Drawing perpendicularly 80 fathoms, 

 and the remainder diagonally. Main 

 beam over the cylinder ; one balance 

 bob at the surface, and an angle bob 

 in the shaft. 



F. MiCHELL. 



