Caption on photo: "Chute-a-Caron, Dam for the Alcoa Power Co., Saguenay River, Canada, 1930." Typed caption reads: "Current of stream too swift to permit construction of coffer dam. Dam was built vertically into air then supporting rods were blown...
Caption on photo: "Chute-a-Caron, Dam for the Alcoa Power Co., Saguenay River, Canada, 1930." Typed caption reads: "Current of stream too swift to permit construction of coffer dam. Dam was built vertically into air then supporting rods were blown...
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: "Deep in Ripple Rock, technical experts of the DuPont Company crimp a water-proof sealer on the end of a detonating cord. The cord detonating at the amazing rate of 20,000 feet per second provided virtually instantaneous...
Caption on photo: "Chute-a-Caron, Dam for the Alcoa Power Co., Saguenay River, Canada, 1930." Typed caption reads: "Current of stream too swift to permit construction of coffer dam. Dam was built vertically into air then supporting rods were blown...
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...
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: "A freighter approaches from the north through Seymour Narrows between Vancouver Island and Maud Island, some 120 miles north of Vancouver. Here two underwater peaks, known as Ripple Rock, long a peril to navigation, were blasted...
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...