SINKING AND EQ,UIPPING INaLIlrED SHAFl'S OF MORE THAN. 60. DEGREE DIP by. Wilford Stillman Wright. A THE. SIS submitted to the faoul. ty. of the. SCHOOL OF MINES AND METALLURGY OF THE UNIVElRSITY OF MISSOURI. in partial fulfillment of the work required for the. DEGREE OF ENGI NEER OF MI NEB. Rolla, Mo. 1938Approved. by __ ~~~~ professor of Mining.