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).
Instructions for timing a magneto using a marked tooth and a list of its technical specifications.
| Identifier | ExFiles\Box 48\2\ Scan241 | |
| Date | 23th February 1921 | |
| QL -29- Contd. 23-2-21 on either side of this tooth and the middle portion at the top of the tooth itself being blacked. Timing the magneto by means of this marked tooth will readily give the degree of accuracy which is required. In this connection it should be understood that attention to the magneto contact breaker, set correctly initially, is only necessary infrequently, i.e. at such intervals as the magneto or contact breaker might be removed for other reasons, e.g. trimming the contact points. X 8796 Particulars. Weight 12.5 lbs. Platinum gap .012" H.T. safety gap 8.5 mm. Range 58º - 62º Make ratio .83 Primary resis. (at 19ºC) .96 ohm. Secondary resis. (at 19ºC) 2400 ohms. Rotation - left hand, viewed on driving end. Copy of Specification of Production Inspection & Test is attached. Contd. | ||