"The purpose of this investigation is to compare the relative cutting speeds and efficiency of some of the different types of rock drill bits used in the piston machine, including the regular cross bit, the low center cross bit, a so-called "flat" cross bit, the "Z" bit of the southeast Missouri type, and the Joplin "Bull" bit"--page 2.
Forbes, Carroll Ralph
B.S. in Mining Engineering
Missouri School of Mines and Metallurgy
© 1915 Lister Merriken Cummings, All rights reserved.
Thesis - Open Access
Bits (Drilling and boring) -- Testing
Rock-drills -- Testing
Print OCLC #
Electronic OCLC #
Link to Catalog Recordhttp://merlin.lib.umsystem.edu/record=b2609671~S5
Cummings, Lister Merriken, "Comparative tests of piston-drill bits" (1915). Bachelors Theses. 80.