The switch is thrown on the DuPont Condenser Discharge Blasting Machine and all 900 holes are fired at once. This machine, which builds up enough voltage to set off as many as 1200 holes at one time, removed the need for power lines or portable...
Typed caption on photo: "Water-tight cans of explosives being pushed into the cage at the collar of a 570-foot vertical mine shaft on Maud Island, about 120 miles northwest of Vancouver, B.C. The explosive was used to blow the top off Ripple Rock,...
Typed caption: "Long a menace to navigation, Ripple Rock used to lie in Seymour Narrows, above, 120 miles northwest of Vancouver, British Columbia. If the peaks of the rock had been visible they would have appeared directly above the freighter's...
Periodicals; Chemical industry; Explosives; Dynamite; Plastics industry; Ammunition; Quarrying; Blasting;
Table of Contents: The new president; If I would find a dynamite cap; Pyralin in the shoe industry; DuPont products to the millions; Trapshooting, an ideal sport; Italian firm wins Fabrikoid cup; Interior finishing with Duco; Mound builders worked...
Table of Contents: Gunpowder was scarce in Washington's day; Packages for better selling; The prized pearls of industry; Rayon fabrics, a forecast; West Virginia's greatest tunnel project; The exploding wedge; New Fabrikoid effects and grains for...
Well broken rock was the objective, and the result was what drillers call maximum fragmentation with minimum back break. Along the turnpike the crack and rumbling of blasting has given way to the drone of traffic.
Dynamite is brought up to the face after round has been drilled. DuPont's Special Gelatin 40% strength is widely used in all types of underground blasting.
Typed caption on photo: "F.D. Bickel (left) of the DuPont Company and Jack Buchanan, Northern Construction Company superintendent, study the loading chart of a coyote tunnel in the north pinnacle of Ripple Rock. Shortly thereafter, in the greatest...
Typed caption on photo: "This is the scene in Seymour Narrows, 120 miles northwest of Vancouver, British Columbia, as the largest non-atomic blast in history sheared the tops off the top of the twin underwater peaks of Ripple Rock, one of the...
Typed caption on photo: "Deep into Ripple Rock, drillers drove a 'Coyote' tunnel which was packed with 2,750,000 pounds of high explosives supplied by DuPont of Canada (1956) Limited. Ripple Rock was located just below the surface in Seymour...