In the above drawing the first sketch is indicative of a timber caisson which is set in the river bottom, made watertight with mud and clay and then vacated of the water in the caisson. In the second sketch, a primitive slave-operated pile-driver drives piles (posts) into the river bottom to support a timber crib which will support one of the major bridge pilings. Note the pontoon bridge beside the work stations which is used to transport men and machines to the work areas across the length of the bridge under construction.
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