The Norden Bomb Sight manual

J. Explanation Stabilizer Wiring Diagram M-3 Fig. 7

The M-3 has a two wire electrical system, a power wire and a return wire. The current for the operation of the stabi- lizer comes through the number two pole of the cannon plug from the source of power. The power goes from number two pole to the stabilizer, tor- que motor, bombsight and PDI switches. The number one plug is the return connection.

(1) Stabi- lizer Circuit

When the stabilizer switch is closed, the current flows through the brush contacting the second slip ring from the bottom, or slip ring 2 (see diagram), from the slip ring to the gyro, across a flexible lead, back to the lower slip ring, and then to number one pole, thereby com- pleting the circuit.

(2) Torque Motor Circuit

Close the torque (servo) switch. The current flows to the torque motor, through the motor to the return connection. The current going to the motor branches to the clapper magnets. From the clapper magnets the current goes to the two upper slip rings, 4 and 3, (see Fig. 7). The current from the left clapper magnet (magnet under the brass gear) flows to the third slip ring, then to the lower segments of the isolated sector, through the contact made by the stabilizer brush, across a flexible lead to the lower slip ring, and then to number one pole, or the return. When the right clapper magnet is energized, the current flows through the fourth slip ring to the upper segments of the isolated sector, through the contact made by the stabilizer brush, across a flexible lead to the lower slip ring, and then to number one pole of the stabilizer cannon plug.

(3) Isolated Sector

The isolated sector consists of five seg- ments which are separated by an insulating mat- erial. The five segments are the neutral segment, the upper six-volt segment, upper twelve-volt seg- ment, lower six-volt segment, and lower twelve- volt segment.

FIG. 8