. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 431 PLAN OF COFFER DAM. Figure 1, shewing the third tier of Braces and part of the Locl<. IIS/^. tremity of the lock, there is to be a pUitforra of well squared stone 2 feet ti inches in depth, also the aforesaid grooves and the lock chambers with quoin stones 3 feet long by 2 feet in breadth. Two courses of bond stone are to be built in tlie wing walls and counter- forts, 15 inches thick agreeably to the drawing, the
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 1839.] THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. 431 PLAN OF COFFER DAM. Figure 1, shewing the third tier of Braces and part of the Locl<. IIS/^. tremity of the lock, there is to be a pUitforra of well squared stone 2 feet ti inches in depth, also the aforesaid grooves and the lock chambers with quoin stones 3 feet long by 2 feet in breadth. Two courses of bond stone are to be built in tlie wing walls and counter- forts, 15 inches thick agreeably to the drawing, the beds to be at right angles from the face of the wall, the curved part of the river wings, and also of the wings into the entrance basin, are to be faced with stone for 20 feet in height, 10 feet in length, and 'A feet in breadth on the bed, laid header and stretcher alternately, the heads not to be less than 2i feet long on the face, by at least 4 feet on the bed, the stretcliers not to be less than 4-J feet long on the face, by at least 2 feet on the bed, the face to be well dressed, and the beds and joints cor- rectly worked, and laid flush in mortar; the backing to be of the same sort of stone, laid flush in mortar, to be in lengths from 3 to 5 feet, and iu breadths suitab e to the thickness of the walls, and of the height of the front courses; the stones fur the counterforts are to bond into the wall at least 15 inches, and one stune only is to be used in each counter- fort. Above the top of the inverted arches, the chamber walls are to be built concave, or of a curvilinear form in its vertical direction in the iront—they are to be 5 feet 3 inches at the level of the lower side of the coping, and the back of the walls being perpendicular, will deter- i mine the thickness downwards; there are to be counterforts as shown in the plan and section, tliey are to be founded at li feet above the lowest part of the underside of the inverted arch, and to be carried to within 4 feet
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