CUPBOARD AND CELL LOCKS
Fig. 135
1. The hand of a door is always determined from the outside.
2. The outside is the street side of an entrance door, the corridor side of a room door, and the room side of a closet door. The outside of a communicating door, from room to room, is the side from which, when the door is closed, the butts are not visible. The outside of a pair of twin doors is the space between them. This rule applies to sliding-doors as well as hinged doors.
3. If, on standing outside of a door, the butts are on the right, it is a right-hand door; if on the left, it is a left-hand door.
4. If, on standing outside, the door opens from you, or inwards, it takes a lock with regular bevel bolt; if it opens outwards, it takes a lock with reverse bevel bolt.
5. A door is beveled when its edge is not at a right angle with its surface, and in this case the front of a mortise lock must be beveled to correspond. This bevel is expressed by stating the thickness of door and the distance that one edge drops back of the other. The standard bevel is ⅛ inch in 2¼ inches, as shown in [Fig. 136].
Fig. 136