Show 5 SM t AY AF AL U MIN OU w 4 Z h in the moffat IL ar tunnel heading imea ding east portal in driving uie the six mile moffat tunnel through za ii the continental divide speed is of prime importance the illustration shows the application of the model 39 waugh stoper to the problem of making the upper part of the enlargement in the railroad tunnel east portal the bars ate are set on four foot centers and thirteen holes are drilled approximately 75 feet of hole in ill each semicircular semi circular arc all from one position on oil each bar the exclusive use of the model 39 independent rotation machine for this particular operation is indicative of its high drilling capacity TAOS K D x I 1 LL G C 1 1 I MPA WRANY l C DENVER COLORADO ROCK 14 rew W york chicago st loun louis san francisco canadian rock drill C company lun led sole A alanl iq 19 C canada 0 PUtt burgh D duluth i uluth el alpo paso seattle montreal tl quebec cobalt ont py nalon ta B C vancouver beta eu B C salt lake the denver rock agot drill 11 4 M machinery hina co company any limited scranton houghton birmin birmingham aham butte bulte sole A aali ants in soua anc s and fw south lt life buiu Budd ni nii Tin vl al S mica Potts spottsville pottsville ville knoxville joplin wallace A andreco drebo george company sole avents anal in in japan tolio japan mexico city santiago lima lot angeles angele aclid allied engineering limited Mel melbourne bome Aus australia |