Show aar ka h N ft 4 1 N A va in the moffat tunnel T heading east portal tn driving uie the six mile moa at tunnel through the continental divide speed is of prime importance J the illustration allo shows 1 ws the application of the model 39 AIT waugh a u 7 11 stoper to the problem of making in the upper part paa of the billaro enlargement e in the railroad tunnel east portal the bars are set on oil four foot centers and thirteen holes are drilled approximately 75 feet of hole hold in each semicircular semi circular are arc all from one position on oil each bar the exclusive use of bf the model 39 iii independent dependent rotation ma machine chilie for this particular operation is indicative of its high drill drilling hig capa capacity capacite citi v r ratas rl 0 CR K I 1 j MIM LL affia L 55 U R M PA DENVER COLORADO ROCK abw york chicago st louis loui san feancisco Fian cisco canadian Cao adian rock drill company sole A affif ts in if CJ C J pittsburgh burgh duluth el edpao paso seattle mon 11 1 1 quebec cb coall it ont helon 6 B C vancouver B C scranton salt sail lake the denver rock drill Ma machinery company houghton chineo Hough lOD birmingham butte butle SI sole As in 10 south africa and dein Potts spottsville pottsville ville knoxville joplin wallace southern Soul kern ue life building bu id ng Johannn Johannes burgh transvaal ivl S alca mexico city santiago lima los lo angeles andrewc george georee company Comp ny sole agents in in japan tolio japans aclid engineering limited Luni ted melborne aaris drilla |