Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Illustrated description of giant rig, mounted on tractor, for drilling blast holes for 1200 ft tunnel through rock mountain for construction of $580,000 Arizona highway; drill holes are loaded with 450 lb of 40% 1 1/2-in. stick powder; data on operation.
Illustrated description of giant rig, mounted on tractor, for drilling blast holes for 1200 ft tunnel through rock mountain for construction of $580,000 Arizona highway; drill holes are loaded with 450 lb of 40% 1 1/2-in. stick powder; data on operation.
Open cut methods slash tunnel costs
Excavating Engr
Parker, J.L. (Autor:in)
Excavating Engineer ; 44
1950
Aufsatz (Zeitschrift)
Englisch
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