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).
Procedure for marking ignition timing using a dynamometer shaft-mounted drum and a high tension wire.
| Identifier | ExFiles\Box 37\1\ scan 227 | |
| Date | 4th April 1921 | |
| Contd. -2- Hs{Lord Ernest Hives - Chair}5/LG14.4.21. the ignition is taking place. This arrangement is especially useful when automatic advance is used. A drum marked off in degrees is fixed to the dynamometer shaft; round this drum is clipped a strip of paper. A high tension wire is removed from one of the plugs on the engine and taken to an insulated terminal near the drum so that when the spark passes it shorts through the paper on to the drum and marks the position of the spark has taken place. The engine is run on five cylinders and the wire to the drum earthed until the engine is running at the right condition. Hs.{Lord Ernest Hives - Chair} R.R. 1358 (1M) (S.H. 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2648 | ||