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).
Letter to Messrs. North & Sons, Ltd. detailing the differences between magneto types SP.12-5 and SP.12-2.
| Identifier | ExFiles\Box 43\4\ Scan205 | |
| Date | 10th January 1930 | |
| Messrs. North & Sons,Ltd. Whippendell Rd. Watford. 10th January, 1930. -2- Magnetos type SP.{Mr Spinney}12-5 Nos.98087/8/9/90. The difference between these magnetos and the SP.{Mr Spinney}12-2 type, and their suitability for similar purposes to those of the SP.{Mr Spinney}12-2 were pointed out. It was pointed out by Mr. Allen that the only magnesium alloy casting on this machine was, if we remember rightly, the armature cover. Yours faithfully, FOR ROLLS-ROYCE LIMITED. | ||