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Knight's Mechanical Encyclopedia (ed. Knight), S. (search)
ets them on the body of the safe, with or without an interior plate. Also fire-proofing with alum and non-conducting materials. Hill, 1865, and Hodgson, 1865. Sliding doors of peculiar form to resist the operations of burglars. Loysel, 1865. A protecting wall, revolving or sliding, is placed between inner and outer cylinders or plates; the inner one contains the door, to which access is had by pushing aside the protecting wall when its bolts are released. Parrish, Thatcher, and Glasscock, 1865. Forming a series of dovetail projections on the door frame, which fit corresponding mortises in the door to prevent its being forced open by wedges. Other modifications of this principle, in the form of serrations or undulations in the door and its casing, have since been embraced in various patents. Another method is to form a bead around the door, fitting a groove in the casing. Besides this, various special arrangements have been adopted to prevent the entrance of wedges.