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From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Description of the battery ignition system and the steering column switch.

Identifier  ExFiles\Box 26\2\  Scan121
Date  19th July 1917 guessed
  
Contd.
-7-

BATTERY IGNITION.

The small combined non-trembler ignition coil M and ballast resistance R, carried on the front of the dash, is shown in fig. 58. The function of the resistance is to limit the current taken by the coil at slow speeds, or if the ignition switch and low tension contact happen both to be left "on" when the engine is stopped. It also secures practical equality of intensity of secondary spark at all speeds.

The combined low tension make and break and high tension distributor is illustrated in fig. A small condenser connected across the break is located inside the cover at E.{Mr Elliott - Chief Engineer} The insulated contact and the insulated side of the condenser are brought out to the insulated terminal to which the external low tension connection is made.

STEERING COLUMN SWITCH.

The ignition switch at the base of the steering column, operated by the knurled nut in the centre of the steering wheel, really consists of two electrically independent switches. One of these earths the low tension terminal of the magneto, the other makes or breaks the low tension circuit of the battery ignition. There are four positions of this compound switch giving each ignition "on" separately and both "on" or "off" together; these being indicated thus:- M - magneto on, B - battery on, M & B - magneto and battery on, and O - both off.
  
  


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