Dry Dock

Basin for the repair of ve els, the water being pumped out after the ve el has entered and been secured by lateral shoring. At the Navy Yard in Brooklyn, N.Y., are two large dry docks, one of granite, which is 320 feet long and cost $2,241,000, and the other of timber, which is 530 feet long and cost $566,000. The pumps for the latter have a capacity of are of various kinds. In Zamboni's pile, e.g. , very many disks of paper are cut and coated on one side with tin or silver, and on the other with peroxide of manganese; 1,200 or 1,500 of these are placed in a gla tube with their similar faces all turned the same way. The ends of the pile are connected with bra knobs, that connected with the manganese being positive. Dry piles are remarkable for the permanence of their action.