r end of the
rod. Solder the indicator to this piece and force it in place on
the end of the rod.

When the armature is the same

[Illustration: Details of the Annunciator]

distance from each core, the indicator should be parallel to the
long dimension of the face of the case. The case of the instrument
may be made in the following way:

Secure a piece of 3/8-in. oak, or other hard wood, 3 in. wide and
2 ft. long. Then cut from this board the following pieces: two
whose dimensions correspond to those of Fig. 5 and are to form the
sides of the case; two whose dimensions correspond to those of
Fig. 6 and are to form the back and the face of the case; three
whose dimensions correspond to those of Figs. 7, 8, and 9 and are
to form the lower and upper end of the case and the finish for the
top.

Secure a piece of window glass, 4-1/2 in. by 3-1/8 in. that is to
be used as the front. Before assembling the case cut on the inner
surface of the pieces forming the sides and the lower end, a
groove just wide enough to take the glass and 1/16 in. in depth.
The outer edge of this groove should be 3/8 in. from the outer
edge of the frame. After the case is fastened together there
should be a slot between the piece forming the upper end and the
piece that serves as a finish at the top, that will allow the
glass to be slipped into place. A small strip of wood should be
tacked over this slot, after the glass is put in place, to prevent
the dust and dirt from falling down inside of the case.

The piece upon which the works are to be mounted may be fastened
in place by means of four round-headed brass screws that pass
through the sides of the case. It should be fastened about 1/2 in.
back of the glass front. The back may be fastened inside of the
case in a similar manner.

Cut two pieces, from some sheet brass, whose dimensions correspond
to those of Fig. 10. These pieces are to be used in supporting the
case by means of some small screws. Fasten three binding-posts,
that are to form the terminals of the annunciator, on the top of
the upper end of the case. Mark one of these binding-posts C and
the other two Ll and L2. Connect one terminal of each of the
magnet windings to the post marked C and the other terminal to the
posts Ll and L2. You can finish the case in any style you may
desire. Often times it is desirable to have it correspond to the
finish of the woodwork of the room in which it is to be placed.
The distance the po