Locks fastening must be constructed as much as possible in one piece. When hinges on them are necessary the hinges must be formed by welded joints, and not by riveted pins. If a part of any fastening is attached to a door or a receptacle, it must be by rivets and not by screws. The fastening for cocks must be fitted so closely, as not to admit of any cock being partially turned or opened, or the plug or key fitted up or taken out after the fastening is applied. Chain fastening must not be used, except in cases where it would be impracticable to apply any other description of fastening.
