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ORDINANCE NO. NS-1794 PAGE TWO Auxiliary lockin~ device is a secondary locking system added to the primary locking system to provide additional security. Bolt is a metal bar which, when actuated, is projected (or "thrown") either horizontally or vertically into a retain- ing member, such as a strike plate, to prevent a door from moving or opening. Bolt Drojection (or bolt throw) is the distance from the edge of the door, at the bolt center line, to the farthest point on the bolt in the projected position, when subjected to end pressure. Burglary resistant glazing means those materials as defined in Underwriters Laboratories Bulletin 972. Commercial or industrial buildin~ is a building, or portion thereof, used for a purpose other than dwelling. Component, as distinguished from a part, is a sub- assembly which combines with other components to make up a total door or window assembly. For example, the primary components of a door assembly include: Door, lock, hinqes, jamb/wall, jamb/strike and wall. Cylinder is the subassembly of a lock containing the cylinder core, tumbler mechanism and the keyway. A double cylinder lock is one which has a key-actuated cylinder on both the exterior and interior of the door. Cylinder core or cylinder plug is the central a cylinder containing the keyway, which is rotated to operate the lock mechanism. part of by the key Cylinder ~uard is a hardened metal ring or plate sur- rounding the otherwise exposed portion of a cylinder lock to resist cutting, drilling, prying, pulling, or wrenching with common tools. Deadbolt is a lock bolt which does not have a spring action as opposed to a latch bolt, which does. The bolt must be actuated by a key and/or a knob or thumb turn and when projected becomes locked against return by end pressure.