![]() Each step could cover 5 to 8 feet, in 30 seconds. Once relieved of its load, the intermediary runners would be drawn forward and repositioned for another step. The bridge frame was eased forward along the ground with the weight of the frames moving from the corner runners to intermediary runners, using hoists and the motion of the bucket, until the corner pads could be repositioned. The 1916 walker consisted of identical pairs of 30-foot bridge frames and weight-supporting runners along each side of the dredge. Wilson at Bay City in 1916 in a form similar to Anderson's patent. The first walker, according to John Thompson, Michigan Historical Review, Fall 1986, is attributed to Albert N. The walking mechanism was patented by Vincent G. Running on a 50 hp Charter internal combustion engine, the dredge moved over rough, swampy and slippery ground and through close-cut stumps, where other earth excavators had difficulty. It was a piece of specialized equipment that dug a canal which provided rock fill for roadbed drainage of the completed road. The last remaining display of walking dredges (of some 145 walking machines), it has a unique propulsion design enabling the dredge to cope with drainage problems in a wetlands environment. Last remaining dredge in the United States with unique propulsion system, designed for a wetlands environmentīuilt by the Bay City Dredge Works of Bay City, Michigan, this dredge was used to construct a portion of US 41 called the Tamiami Trail, which connected Tampa with Miami through the Everglades and Big Cypress Swamp.
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