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abutment anchor annexed figure approaches Army arranged artillery assistants balks battery berme besieged boats bottom branch bridge brigade brushwood cable cap-sill Cavalry chess chief of sap command commenced construction course covered crowned cubic debouche depth diameter direction ditch double sap earth embrasure employed engineers epaulement excavation executed fagot fascines finished fire flying sap foot fortress four feet frame front gabionade gabions gallery ground gunwales height hurdle Infantry interior slope interval laid lashed military necessary non-commissioned officers officers parapet party pass pickaxe pickets placed plank ponton pushed raft rear reverse revetment rods roller sand-bags sap-roller sappers scantling second parallel second relief shaft sheer line sheeting shore shovel side siege SIMPLE SAP six feet soil stanchions stream task terreplein thick three feet throw timber tion tracing traverse trench trestle U. S. Army United States Army up-stream white tape width workmen yards
Página 23 - The axis of the bridge should be as nearly as possible perpendicular to the direction of the current of the stream.
Página 30 - Two strong lines are extended and lashed, the one over the bows, the other over the sterns of all the pontons; these lines should be considerably longer than the bridge, and the ends coiled on the platform. The bridge is then allowed to float down to within fifteen yards of the first abutment. The material for the first abutment and bay is brought down in a ponton, two strong pickets are planted...
Página 41 - The upstream end of each log should be drawn on shore and beveled to a whistle shape, so as to present less obstruction to the action of the current. Arrange the timber in the position it is to have in the raft the butts alternately up and down stream, the up-stream ends forming a right angle, salient up stream.