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).
Price and specification comparison for Smith dynamo models 3D and 4D.
| Identifier | ExFiles\Box 50\1\ Scan034 | |
| Date | 11th February 1921 guessed | |
| -94 Contd. Smith dynamo 3D. Quantity price with all minor improvements required by R.R. £15.5.0. Weight 25 lbs. Output perhaps rather small for large car. (10 ampere machine). Smith dynamo 4D. Quantity price ditto £11.10.0 Weight 19 lbs. (8 ampere machine). Possibly suitable for small car. Contd. | ||