Show drill ng deep holes something i ew in rock drilling for leep holes is reported from Geri naDy alere IIo warth ami alski have a device for utilizing hie flugl ing water instead of tl e boring rod to con vey motive power to the borer the bor ing being doi e bv a hydraulic motor at cached to the bottom of the roda water under pressure teeing forced through the hollow rod to the motor the escaping water doing the flushing tl e engineers ment ionel say that mth gares sura of pounds the test motor gaie twelve per second consuming I 1 1 gallons of water and that the 8 inch bit drilled through hard sandstone at aba rate of 26 inches per hour in soft sandstone at th rate of 23 feet per I 1 our |