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000 tons, and was 5 stories high, presenting accommodation for 450 guests, none of whom were disturbed during the operation. Tremont House, another hotel of a similar size, was also raised without accident. The screws employed were about 2 feet long, 2 1/2 inches in diameter, with a pitch of half an inch. They worked in cast-iron sockets, and were moved by handspikes: 1,450 such screws and 600,000 cubic feet of timber were used in raising the Briggs House. A similar plan was adopted in July, 1868, at Boston, when whole streets of houses were raised in blocks of 6 houses together. Screw-jacks. Screw-key. A spanner for the articles which socket upon the mandrel-screw. The lever of a screw-press. A form of key used with lock-faucets. Screw-lock. Screw-lock. (Locksmithing.) This lock has various forms, and is used for hand-cuffs, fetters, manacles, and also as a padlock. The essential feature is an opening bar, which is detained by a screw when in a locked po