oyed in the Western Electric No. 1
relay board, is shown in Fig. 363. These are mounted in banks of ten
pairs, a common dust cap of sheet iron covering the entire group.

The Western Electric supervisory relay, Fig. 364, is of the tilting
armature type and is copper clad. The dust cap in this case fits on with
a bayonet joint as clearly indicated. In Fig. 365 is shown the line
relay employed in the Western Electric No. 10 board.

[Illustration: Fig. 366. Kellogg Line and Cut-off Relays]

[Illustration: Fig. 367. Strip of Kellogg Line and Cut-Off Relays]

The Kellogg Company employs the type of relay of which the magnetic
circuit was illustrated in Fig. 95. In its multiple boards it commonly
mounts the line and cut-off relays together, as shown in Fig. 366. A
single, soft iron shell is used to cover both of these, thus serving as
a dust shield and also as a magnetic shield to prevent cross-talk
between adjacent relays--an important feature, since it will be
remembered the cut-off relays are left permanently connected with the
talking circuit. Fig. 367, which shows a strip of twenty such pairs of
relays, from five of which the covers have been removed, is an excellent
detail view of the general practice in this respect; obviously, a very
large number of such relays may be mounted in a comparatively small
space. The mounting strip shown in this cut is of heavy rolled iron and
is provided with openings through which the connection terminals--shown
more clearly in Fig. 366--project. On the back of this mounting strip
all the wiring is done and much of this wiring--that connecting adjacent
terminals on the back of the relay strip--is made by means of thin
copper wires without insulation, the wires being so short as to support
themselves without danger of crossing with other wires. When these wires
are adjacent to ground or battery wires they may be protected by
sleeving, so as to prevent crosses.

[Illustration: Fig. 368. Monarch Relay]

An interesting feature in relay construction is found in the relay of
the Monarch Telephone Manufacturing Company shown in Figs. 368 and 369.
The assembled relay and its mounting strip and cap are shown in Fig.
368. This relay is so constructed that by the lifting of a single latch
not only the armature but the coil may be bodily removed, as shown in
Fig. 369, in which the latch is shown in its raised position. As seen,
the armature has an L-shaped projection which serves to operate the