Manual of military engineering . e, a raft thick and thin ends alternating ; they should then be stronglysecured with rope, and, if possible, by cross and diagonal piecesof timber fastened by spikes or wooden trenails ; or the logscan themselves be connected by dogs. If a raft is to be used as a pier in a bridge, it will frequentlybe necessary to place the logs in two layers, to avoid obstructingthe waterway. A central raised transom must be up-stream end of the raft may, with advantage, be slightlyconvex. Rafts are most easily put together and manipulated in 167. A
Manual of military engineering . e, a raft thick and thin ends alternating ; they should then be stronglysecured with rope, and, if possible, by cross and diagonal piecesof timber fastened by spikes or wooden trenails ; or the logscan themselves be connected by dogs. If a raft is to be used as a pier in a bridge, it will frequentlybe necessary to place the logs in two layers, to avoid obstructingthe waterway. A central raised transom must be up-stream end of the raft may, with advantage, be slightlyconvex. Rafts are most easily put together and manipulated in 167. Anchors are of various weights. For ordinary bridgeof bridges, work 5G-lb. anchors, with a reserve of 112-lb. anchors, willgenerally suffice for moderate streams. The cables are generally of 3-inch rope. The length of cable out should be ten times the depth of the stream, and rarelyless than 30 yards. The cable is attached to the ring of theanchor (PI. 55, Fig. 1) by a fishermans bend ; a buoy should I I/rt^> 55. ANCHORS ^^.^.. CrownX—^
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