is in the rock may be drilled 6 or 8 inches diameter, it not being necessary to exclude the water from the well. 4 to 5 feet long. These are screwed together, forming necessarily applied, and for such wells the machinery the string of tools, and there is, in addition, the tem- In drilling an oil or… … when the same apparatus is used which is placed what is called a PORTABLE APPARATUS POR DRILLING WELLS 100 TO 600 PEET DEEP for putting down hundreds of temper screw. This screw is 5}£ wells. feet long; it is carried between The Pierce Iron Works are at the foot of Sixth two wrought iron rejps, at…
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