supposed to open out into the street or behind windows overlooking
the country, there are hung, or set, short drops or wings painted
to show parts of a street, a garden, or a country-side, and these
are called "exterior backings."

[1] When flats are used as backings they are made stable by the
use of the _stage-brace_, a device made of wood and capable of
extension, after the manner of the legs of a camera tripod. It
is fitted with double metal hooks on one end to hook into the
wooden cross-bar on the back of the flat and with metal eyes on
the other end through which _stage-screws_ are inserted and screwed
into the floor of the stage.

_The Centre-door Fancy_ is the most common of the box sets. Called
"fancy," because it has an arch with portieres and a rich-looking
backing, and because it is supposed to lead into the other palatial
rooms of the house, this set can be used for a less pretentious
scene by the substitution of a matched door for the arch.

In this plainer form it is called simply _The Parlor Set_. Sometimes
a parlor set is equipped with a French window, but this should not
be counted on. But there are usually a grate and mantelpiece, and
three doors. The doors are designed to be set, one in the rear
wall, and one in each of the right and left walls. A ceiling-piece
is rarely found, but borders are always to be had, and a chandelier
is customary.

_The Kitchen Set_ is, as the name implies, less pretentious than
the changeable parlor set. It usually is equipped with three
doors, possesses matching borders, may have an ordinary window,