Annunciator Clock.
A clock operating an annunciator by making contact at determined times.
Annunciator Drop.
The little shutter which is dropped by some forms of annunciators, and
whose fall discloses a number, character or inscription, indicating
whence the call was sent.
Fig. 15. DROP ANNUNCIATOR.
Fig. 16. ANNUNCIATOR DETACHING MECHANISM.
Annunciator, Gravity Drop.
An annunciator whose operations release shutters which fall by gravity.
Annunciator, Needle.
A needle annunciator is one whose indications are given by the movements
of needles, of which there is usually a separate one for each place of
calling.
Annunciator, Swinging or Pendulum.
An annunciator which gives its indications by displacing from its
vertical position a pendulum or vertically suspended arm.