When the Operator moves the Remote Ignition switch to "ON" position, an Ignition Relay in the Local Station Control Box is energized and closes its contacts. A Ground circuit from the Local Station Control Box is then fed through the Ignition Relay contacts, through the Turntable IGNITION Slip Ring to the IGNITION RELAY "F", which becomes energized. This Relay supplies a Battery feed through its SOL terminal to the Engine IGNITION COIL, to and through the CRANKING TIME LIMITOR, to and through the AUTOMATIC CIRCUIT CONTROLLER to the STARTIX. The STARTIX supplies the heavy Battery feed to the STARTER to turn the Engine over until it fires and the Siren will begin to Idle. As soon as the Engine starts the STARTIX automatically prevents further cranking.

When the Engine starts, GENERATOR RELAY "H" becomes energized; it supplies a Battery feed to the THROTTLE RELAY "G" and the PENN SWITCH "L" contactor. When the Engine started, the oil pressure tripped the PENN SWITCH movable arm contactor "L" against the "ON" position contact "D", the Battery feed supplied from PENN SWITCH terminal "D", through Turntable SIGNAL Slip Ring, to Signal Relay in Local Station Control Box,. which becomes energized and closes its contacts, completing a circuit to cause a Signal Light to GLOW at Central Headquarters Station, indicating to the Operator that Siren is running and Engine has normal oil pressure and water temperature.

When the Operator pushes the Remote Throttle Switch "ON", a Throttle Relay in the Local Station Control Box is energized and closes its contacts. A Ground circuit, from the Local Station Control Box, is then fed through the Throttle Relay contacts, through the Turntable THROTTLE Slip Ring to THROTTLE RELAY "G" energizing it. When THROTTLE RELAY "G" closes its contacts, a Battery feed is supplied to energize the THROTTLE SOLENOID which snaps its plunger out to move the Engine Carburetor Throttle to the wide open position. Immediately Siren speed increases to 4600 R.P.M. Release of pressure on the Remote Throttle Switch and Siren speed returns to 650 R.P.M. Idle speed.

Upon completion of any Signal operation, the Operator moves the Remote Ignition Switch to the "OFF" position. This will interrupt the Engine Ignition Circuit and stop the Engine. The Signal Light will go out, indicating to the Operator the Siren Engine is Secured until further operation is desired.

The following is the sequence of events as they would occur in case of failure due to excessive Engine Speed (4700 R.P.M.) Low Oil Pressure (15) psi). High Water Temperature (200 degrees F.).

When the IGNITION RELAY "F" became energized and furnished a Battery feed through its "SOL" terminal to the IGNITION COIL and Starting circuit to start the Engine, it also supplied a Battery feed to the IGNITION CUTOUT RELAY "E", the GENERATOR RELAY "H" and the OVERSPEED GOVERNOR.

SHOULD THE ENGINE OVERSPEED:
The Governor's normally open contacts will close and supply a Battery feed to energize the IGNITION CUT-OUT RELAY "E". The INT-PRI contacts of this Relay will Ground the Engine IGNITION COIL and Stop the Engine. The Remote Control Operator will know some Safety Control has stopped the Siren because the Signal Light has gone out.

Once the IGNITION CUT-OUT RELAY "E" is energized, it will become self-energized through its "SOL" contact until the circuit is broken by turning the Remote Ignition Switch "OFF". After failure has been corrected, the Engine may be restarted by turning the Ignition Switch back "ON".

SHOULD OIL PRESSURE DROP BELOW FIFTEEN (15) PSI:
The PENN SWITCH movable arm contactor "L" will trip from the "ON" contact "D" to the "OFF" contact "M", to supply a Battery feed to energize the IGNITION CUT-OUT RELAY "E". The INT-PRI contacts of this Relay will ground the Engine IGNITION COIL and Stop the Engine. The Remote Control Operator will know some Safety Control has stopped the Siren, as the Signal Light has gone out.

Once the IGNITION CUT-OUT RELAY "E" is energized, it will become self-energized through its "SOL" contact until the circuit is broken by turning the Remote Ignition Switch "OFF". After failure has been corrected, the Engine may be restarted by turning the Ignition Switch back "ON".

SHOULD ENGINE WATER TEMPERATURE EXCEED TWO HUNDRED (200) DEGREES F.:
The actions of the PENN SWITCH, IGNITION CUT-OUT RELAY "E" and Remote Signal Light are the same as described in the low oil pressure failure, with this exception. The PENN SWITCH will not allow its movable arm contactor "L" to trip back to "ON" position "D", until the Engine Water Temperature cools down below the critical value.