THE DUAL IGNITION

(See photograph on page 29)

The magneto A and the coil B are independent sources of high tension current, either of which, by the change-over switch, C, can be connected to the common distributor, D, which is in permanent contact with the ignition plugs.

The contact breaker for the primary current of both systems is contained in D.

The switch C opens the battery circuit when the magneto is in use, and leaves the magneto primary on open circuit when the battery is in use.

There is a window in the face of the switch C through which the position of the contacts can be seen.

THE IGNITION CIRCUITS.

The diagrams show the primary and the secondary circuits separately. In the primary circuit, the change-over switch is shown in the position which brings the battery-coil ignition into action. Current flows from the battery through the ammeter and switch to the terminal IG on the junction board. Thence to terminal B+ on the coil. From terminal C on the coil to terminal C at the back. or primary side, of the change-over switch; thence from CB to the contact breaker. On the secondary side of the change-over switch, connection is made from C to D,

With the change-over switch on the magneto, contact is made from M to CB on the primacy side and from M to D on the secondary side. Under these conditions, the battery ignition circuit is opened at C irrespective of the position of the switch on the switchboard.