GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



395 



STEAM ENGINES, IN SEPTEMBER 1834. 



Number 



of 

 strokes. 



Lgth 

 of the 

 stroke 

 in the 

 pump. 



Load, in 

 1 pounds. 



Pounds lifted 

 one foot high, 

 by consum- 

 ing a bushel 

 of coal. 



Num- 

 ber of 



strokes 

 per 



minute 



REMARKS, AND ENGINEERS' NAMES. 



153650 



feet 

 6 



4,5 



19078 

 2840 



32,477,832 



3,68 



Drawing the load in two shafts per- 



non /1 1 /^nl n vl tT TtTlfri rirl*^in n(3nm Tm/iot" 



ptinGicuidriy, wiuu ixiaiii u^^txiii uxjutr 

 the cylinder. 328 fathoms of horizon- 

 tal rods, connected to three bobs at 

 the surface, and 103 fathoms of dry 

 rods in the shafts. 



245100 



6 



11664 



42,248,961 



5,88 



Drawing perpendicularly, with main 

 beam over the cylinder. 



TT T 



JIOCKING AND JuOAH. 



250430 



7,4 



40365 



69,391,179 



6,0 



Drawing perpendicularly. Main beam 

 over the cylinder, and one balance bob 

 at the surface. 



Sims and Son. 



209870 



7 



18043 



48,636,313 



5,2 



Drawing perpendicularly. Main beam 

 over the cylinder ; one balance bob at 

 the surface. 



Sims and Son. 



244520 



6,5 



24187 



56,038,387 



6,06 



Drawing the load perpendicularly, with 

 main beam over the cylinder, and one 

 balance bob at the surface. 



Sims and Son. 



179840 



7,25 



74400 



53,653,592 



4,46 



Drawing all the load perpendicularly. 

 Main beam over the cylinder ; one 

 balance bob at the surface, and two 

 balance lifts (40 fathoms of 17 inches) 

 in the shaft. 



Sims and Son. 



118140 



7,25 



31645 



48,228,500 



2,93 



Drawing perpendicularly. Main beam 

 over the cylinder. 



Sims and Son. 



133700 



9,25 



47317 



97,856,382 



3,2 



Drawing perpendicularly. Main beam 

 over the cylinder one balance bob at 

 the surface. 



W. Petherick and W. West. 



