while in The bridge is kept square with the rails, other forms a pendant platform is used, by some form of squaring device, either a cross shaft insuring equal propelling the operators turning cranks, and riding with the bridge. speed to the truck wheels at both ends In some cases an entire clear… … HAND TRAVELING CRANE. OVERHEAD TROLLEY CRAB. form a portion of the bridge propelling form surrounding the trolley and tra- gear, and insure the uniform movement vel both with the trolley and the desired for both ends, the action being bridge. All the functions are then similar to the parallel…
Engineering
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