1876.] 



379 



[Lesley. 



this "conductor" of which we have been speaking, whether of wood, cast- 

 iron or casing, needs only to be 6" in diameter, inside naeasnrement. But 

 if the well is to be drilled "dry," an 8'' conductor must be used, as will 

 be seen further on. 



In the first case (for a wet well), after the conductor is in place, a plain 

 5^" hole is drilled all the way to the oil rocks ; the water, meantime, nearlj'- 

 filling the well, or perhaps overflowing at the top of the conductor. 



In the latter case (for a dry hole), an 8" hole is to be drilled from the 

 bottom of the conductor to a point below the water veins. When this is 



* These are evidently errors in Nos. 116, 137 and 138 as the bottom of the Stray 

 S. S. as here given overlaps upon the 3d S. S. 



