[Illustration: Fig. 54. Monarch Direct-Current Receiver]

This receiver, like the one of the Automatic Electric Company, does
not rely on the shell in any respect to maintain the permanency of
relation between the pole pieces and the diaphragm. The cup _5_, which
is of pressed brass, contains the voice-current coils and also acts as
a seat for the diaphragm. The entire working parts of this receiver
may be removed by merely unscrewing the ear piece from the hard rubber
shell, thus permitting the whole works to be withdrawn in an obvious
manner.

Dean Receiver. Of such decided novelty as to be almost revolutionary
in character is the receiver recently put on the market by the Dean
Electric Company and shown in Fig. 55. This receiver is of the
direct-current type and employs but a single cylindrical bobbin of
wire. The core of this bobbin and the return path for the magnetic
lines of force set up in it are composed of soft iron punchings of
substantially =E= shape. These punchings are laid together so as to
form a laminated soft-iron field, the limbs of which are about square
in cross-section. The coil is wound on the center portion of this _E_
as a core, the core being, as stated, approximately square in
cross-section. The general form of magnetic circuit in this instrument
is therefore similar to that of the Automatic Electric Company's
receiver, shown in Figs. 52 and 53, but the core is laminated instead
of being solid as in that instrument.

[Illustration: Fig. 55. Dean Steel Shell Receiver]

The most unusual feature of this Dean receiver is that the use of hard