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).
Production cost breakdown for a Battery Box (X.1304) and a Battery Ignition system (X.3129).
| Identifier | ExFiles\Box 50\1\ Scan027 | |
| Date | 1st November 1923 | |
| -3- Contd. Battery Box. (X.1304). Present cost of production £3.16.7 Battery Ignition. (X.3129). Present cost of production :- Contact breaker and distributor. £15.17.4 H.T. wiring and Tubes (including magneto £4.16.8 wiring). Condenser. £2. 7.1 Ignition coil. £4. 8.2 Ballast resistance. £1. 7.7 Steering column switch. £3. 0.9 Total. £31.17.7 Subtract H.T. wiring £4.16.8 & tubes. Steering column switch. £3.09. £ 7.17. 5 £24. 0. 2 Contd. R R 9928/3 (T) 100 11.23. 'H.S.' 1466-11-2-21 2M | ||