GEOLOGICAL SOCIETY OF PENNSYLVANIA. 



393 



. 



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. 



279090 



feet 

 8,75 



09194 



72,552,315 



6,67 



Drawing perpendicularly. Main beam 

 over the cylinder ; two balance bobs 

 at the surface, two ditto under ground, 

 and a balance lift 31 fathoms of 17 

 inches in the shaft. 



Hocking and Loam. 



126290 



7,5 



63482 



55,367,001 



3,02 



Drawing the load perpendicularly. 

 Main beam over the cylinder ; one 

 balance bob at the surface, two ditto 

 underground, and a balance lift in the 

 shaft. 



Hocking and Loam. 



259030 



7,5 



94839 



55,479,101 



6,18 



Drawing perpendicularly. Main beam 

 over the cylinder; two balance bobs at 

 the surface, and two balance lifts in 

 the shaft. 



OoCKING AND LoAM. 



288380 



7,5 

 6 



59584 

 13368 



45,714,778 



6,9 



Drawing perpendicularly. Main beam 

 over the cylinder ; one balance bob at 

 the surface, one under ground, and 

 50 fathoms of diagonal rods in the 

 shaft. 



Hocking and Loam. 



161710 



7,5 



50828 



56,659,438 



3,87 



Drawing all the load perpendicularly. 

 Main beam over the cylinder; two 

 balance bobs at the surface, and one 

 balance lift in the shaft. 



Hocking and Loam. 



183520 



8 



79044 



49,806,540 



4,39 



Drawing the load perpendicularly. 

 Main beam over the cylinder, and one 

 )alance bob at the surface. 



Hocking and Loam. 



353840 



7,5 



15219 



83,703,757 



8,47 



Drawing all the load perpendicularly. 

 Main beam over the cylinder, and one 

 jalance bob at the surface. 



Hocking and Loam. 



I.— 2 z 



