ch ties them together forming the runway for the
cables between them. But two of these units, including two sections of
each frame, are shown installed, the provision for growth being
indicated by dotted lines.

The battery room in this case provides for the disposal of the battery
cells in two tiers. This room is merely partitioned off from the
distributing or terminal room. Where this is done the partition walls
should be plastered on both sides so as to prevent, as far as possible,
the entrance of any battery fumes into the apparatus rooms.

The wire chief's desk, as will be noted, is located in such a position
as to give easy access from it not only to the distributing frames and
relay rack, but to the power apparatus as well.

_Combined Main and Intermediate Frames._ For use in small exchanges, the
Western Electric Company has recently put on the market a combined main
and intermediate distributing frame. This is constructed about the same
as an ordinary main frame, the protectors being on one side and the line
and intermediate frame terminals on the other. The lower half of the
terminals on each vertical bay is devoted to the outside line terminals
and the upper half is devoted to intermediate frame terminals. This
arrangement is indicated in the elevation in Fig. 419. With the use of
this combined main and intermediate frame, the floor plan of Fig. 418
may be modified, as shown in Fig. 420.

[Illustration: Fig. 419. Combined Main and Intermediate Frames]

[Illustration: Fig. 420. Small Office Floor Plan]

[Illustration: Fig. 421. Terminal Apparatus--Small Office]

In Fig. 421 is given an excellent idea of terminal-room apparatus
carried out in accordance with the more usual plan of employing separate
main and intermediate distributing frames. At the extreme right of this
figure the protector side of the main frame is shown. It will be
understood that the line cables terminate on the horizontal terminal
strips on the other side of this frame and are connected through the
horizontal and vertical runways of the frame to the protector terminals.
The intermediate frame is shown in the central portion of the figure,
the side toward the left containing the answering-jack terminals, and
the side toward the right the multiple jack terminals, these latter
being arranged horizontally. This horizontal and vertical arrangement of
the terminals on the main and intermediate distributing frames has been
the distinguishing