STATION AR Y ENGINES.

217

The next example gives the plan of the water-works as adopted atBerwick-on-Tweed. The works comprise two tanks for storing springwater, one with the top water at a level of 16 feet above ordinanceand the other 12 feet higher. The upper tank, which occupies the siteof an old quarry, is 80 X 50 feet and 7 feet deep, and has three wallsbuilt of dry rubble stones, to admit the water from the springs

Upper TccnJo

S ecticnv C D

— Upper. Xfppkr

lower Tcxrikti

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Fig. 137.—General Arrangement of Tanks, Engine and Boiler Houses, Berwick-on-TweedWater-works.

rising behind the walls; the wall next the river is built of water-tight masonry in cement, with a puddle wall at the back of it. Thelower tank, which is 70 x 20 feet and 7 feet deep, has solid wallslike the large one, and receives the water from several springs, whichrise at a lower level than those stored in the upper tank. An engineand pump and boiler, with engine and boiler house, complete theworks at the collecting ground; and a 9-inch rising main conducts