Manual of Military Field Engineering for the Use of Officers and Troops of the Line

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Page 14 - BA. 19.—To erect a perpendicular to a line from a point without. Let X (Fig. 5) be the point without, then, with X as a center, and a distance greater than XA as radius, describe an arc cutting BC at D and E. With D and E as centers, and with a radius greater than DA. describe arcs cutting each other at Y. Join X and Y. Then will XY be perpendicular to BC.
Page 97 - Fig. 5, viz., joining two points, one at the top and the other at the bottom of a slope, the short nanks affording but limited opportunity for enfilade fire.
Page 17 - To draw a line parallel to a given line and at a given distance from it. Let AB (Fig. 9) be the given line. From any two points, as C and D, erect perpendiculars.
Page 201 - J^-in. breast line, in order to mark its position and serve as a means of raising it. The breast line is attached to the buoy ring by a fisherman's bend and round the shank of the anchor, close to the crown, by a clove hitch. 343. — The number of anchors will depend on the strength of the current. It is generally sufficient to cast an anchor up-stream for every alternate boat or ponton, and half that number downstream. If the stream is rapid, every boat should be anchored up-stream. If very rapid,...
Page 18 - Multiply the sum of the two parallel sides by the perpendicular distance between them, and half the product will be the area.
Page 192 - To form a pier of logs. (PI. 43, Fig. 5.) The largest and longest logs should be selected. Branches and knots should be trimmed off. The ends of the logs should be painted if the raft is to be used any length of time. The raft should be built in the water. Select a place where there is little current and where the bank slopes gently to the stream. Throw the timber into the water and moor it close to the shore. Note the natural position of each log in the water before putting it in the rart.
Page 171 - XVI.— Floating Bridges. 288.— The passage of a stream may be effected, In many cases, as described in the preceding chapter. If the methods there laid down are not suitable or expedient, and the stream cannot be forded, then resort must be had to ferrying by boats, rafts, flying bridges, or to floating bridges. 289.— The selection of a place and means of crossing a river is determined by a reconnaissance, which should be as detailed and extensive as circumstances will permit, and embrace the...
Page 176 - The angle of 55° with the current divides its force against the side of the boat into two components: one, perpendicular to the sheer line, which is counteracted by the resistance of this line ; the other, parallel to it, which moves the boat. A boat for this kind of ferry should be narrow and deep, with nearly vertical sides. If a raft is used, it should...
Page 70 - Extension of 2d and 3d Beliefs. Each man of the 1st relief, after completing his task, scrapes his tools and lays them together in rear of the trench. The task being completed, each man secures his accoutrements and rifle, and then, under direction of his officers, closes In to the left (or right), forming column of fours, which Is then marched back to camp. As an Incentive to rapid work, each relief should be allowed to return to camp on the completion of its task. If the working party be large...
Page 174 - The thickness of ice may be increased, when the temperature is low, by throwing water on it. When a stream is frozen on each side but open in the middle, in consequence of the velocity of the current, a boom stretched across the open space will often check the velocity sufficiently to allow the water to freeze.

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