Quantcast Figure 9-6.--IC/B3S4 bell.
 

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27.297
Figure 9-6.--IC/B3S4 bell.
27.299
Figure 9-8.--IC/Z1D4 buzzer.
resonating projections to give the sound a distinctive
frequency characteristic. The resonated horn is
designed in a variety of types, differing as to
intensity, frequency, or power supply. Figure 9-9 is
an illustration of a resonated horn.
Motor-operated horns (types IC/H8D3, IC/H8D4,
and IC/H8S3 use electric motors to actuate the
27.298
Figure 9-7.--IC/B2D4 bell.
Horns
There are three types of horns used with the
alarm, safety, and warning systems. They are (1)
non-resonated horns, (2) resonated horns, and (3)
motor-operated horns.
Nonresonated horns (types IC/H1D4, IC/H4D2,
and IC/H4D3) use a diaphragm actuated by a
vibrating armature to produce sound of the required
intensity.
27.300
Resonated horns (types IC/H2S4 and IC/H2D4)
Figure 9-9.--Resonated horn.
also use diaphragms and, in addition, have

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