| Chrysler Air Raid Siren Maintenance Manual | |
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WARNING SIGNAL
The Warning Signal consists of a variation in the sound tone of the
Siren called "Warbling". This is produced by increasing the speed of the
Siren Engine to 4600 R. P. M. then decreasing the speed of the Siren
Engine, repeating the cycle in regular intervals for a Three minute
period. The required intervals can be regulated by using the
second hand of an ordinary watch, a satisfactory fluctuating note will
be obtained by operating the Throttle Switch on an 8 second. "ON" and 4
second "OFF" cycle, repeating that sequence for, the Three minute
duration of the "Warning" Signal. Remote Control Operation TO GIVE "WARNING" SIGNAL: 1. Move Ignition Switch to "ON" position. 2. When Signal Light GLOWS, it will indicate the Siren Engine is running and ready for operation. 3. To "Warble" Siren, press Throttle Switch "ON" for 8 seconds, release to "OFF" for 4 seconds, "ON" 8 seconds, "OFF" 4 seconds. Repeat in that sequence for the Three minute duration of the Signal. 4. Upon completion of "Warning" Signal allow approximately Two minutes time to elapse before moving Ignition Switch to "OFF" position. 5. Move Ignition Switch to "OFF" position to stop Siren Engine. Local Control Operation TO GIVE "WARNING" SIGNAL: 1. Move Selector Switch from REMOTE to MANUAL position. 2. Pull Ignition Switch to "ON" position to start Siren Engine. 3. To "Warble" Siren, press Throttle Switch "ON" for 8 seconds release to "OFF" for 4 seconds, "ON" 8 seconds, "OFF" 4 seconds. Repeat in that sequence for the Three minute duration of the Signal.4. Upon completion of "Warning" Signal allow approximately Two minutes time to elapse before moving Ignition Switch to "OFF" position. 5. Push Ignition Switch to "OFF" position to stop Siren Engine. 6. Move Selector switch from MANUAL to REMOTE position.
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