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September, 1910 1c. 2--Frian or Locks anp Caissons AROUND THE and carried from derricks resting on the top of these caissons. The accompany- ing illustrations will help the under- standing of the following description. The first step will be to drive on either side of the wreck and about 20 ft. away from it, an ordinary pile and timber dock founded on straight and battered piles driven, as shown in Fig. 3, well down into the soft mud bottom of the harbor. These docks are to be some 40 ft. wide so that their outside TAE. MarRINE REVIEW edges will be about 60 ft. away from the sides of the vessel. built, there will be sunk in the space between each dock and the vessel a series of timber compressed-air caissons, each 15 x 40 ft. in plan. These caissons are to be sunk side by side, as drawn. in the plan in Fig. 2, as near together as is possible and also as near to the side of the wreck as various projections thereon will permit. As at present de- signed, there are to be six of these cais- The docks once . 359 C=Ca/ssons MAINE. sons on each side, extending up to within some 60 ft. of the bow of the vessel. On account of the twisted and torn condition of the ship's frame work at this end, it is thought useless to attempt to continue the raising ap- paratus any farther forward, but in case it is found, after work has commenced, that such a continuation is desirable, it will be a simple matter to sink extra caissons near this portion of the wreck. 'The caissons are to be of the ordinary Tic. 3--SeEction TuHroucH Docks, CAISSONS AND Hui of Maine SHowinc Detait oF RAtIsinc DEVICE. ROU ' :