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.
[Illustration: FIG. 136]
6. The =bevel of a lock= is a term used both with mortise and rim
locks to indicate the direction in which the bevel of the latch bolt
is inclined. If inclined outwards, as for doors opening inwards, it
is a _regular bevel bolt_; if inclined inwards, as for doors opening
outwards, it is a _reverse bevel bolt_ (except as to cabinet locks,
which, being commonly used on doors opening outwards, are regularly
made with reverse bevel bolts, unless otherwise specified).
Mortise locks used with double doors having either rabbeted or
astragal joints, must have fronts of corresponding sectional form.
To avoid the extra cost of special patterns, the edges, or joints, of
such doors should conform to established lock standards. The standard
rabbet, or step, in the edge of doors is ½ inch, and the standard
astragal joint has a ¾-inch bead.
The proper bevel of a door, if any is needed, is determined by the size
of butt and the width of the door, as shown in Fig. 137. The inner
corner of the door travels on a radius with the center at the center
of the pin of the butt, and must have a clearance to swing free of the
jamb casing. This may be obtained by beveling the edge of the door, or,
if its edge is left square, by leaving sufficient clearance between
the door and its jamb. If the door is of fair width and the butt does
not need to be very wide to clear the trim, it will be found that a
square edge may be used without resorting to an unduly open joint, thus
permitting the use of locks with regular front; that is, not beveled.
[Illustration: FIG. 137]