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National Geographic : 1964 Apr
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Slab-setter Leapfrogs Across the Water on Its Own Portable Road to cap, to a tolerance of a quarter of an inch, you had 75 more feet of oversea trestle. This done, the Slab-setter rolled 75 feet forward, on wheels, along its own 150-foot base framework. It then picked up the half of its framework just vacated, swung it spec tacularly out over the ocean, and lowered it onto the next set of caps (above). It was an assembly-line job. Piles. Caps. Slabs. Then concreting the components to 606 gether under stress and tension, bonding them into a monolithic defiance of the worst that battering sea and pounding traffic could do. Finally, guard railings, mercury-vapor light ing towers, telephone lines, signal lights, as phalt, and speed-limit signs. West Island was as far as I could drive. I walked through Chesapeake Channel Tunnel to East Island and Trestle C. En route, I watched tilesetters happily slapping white
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