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).
Bench test report on modified 30° range Watford IS 12 aero magnetos, comparing their performance to B.T.H. magnetos.
| Identifier | ExFiles\Box 43\4\ Scan134 | |
| Date | 20th July 1928 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8 12 24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To: E.7.C. Order No.: WD{Mr Wood/Mr Whitehead} 2. Customer's No.: X 4021 Modified 30° range Watford IS 12 aero magnetos We have now bench tested two of these magnetos Nos 98033/4 recently purchased from Messrs Norths. One of them No. 98034 was tested to our latest general specification (with braided cables) and the other to our complete schedule of expl magneto performance with certain items pertaining exclusively to the general specification included. Our general impression of these magnetos is that they are exceptionally good at high speeds i.e. better than the B.T.H, but at low speeds fully retarded the B.T.H is generally the better although Signed: (contd) This Sheet must be filed on completion of the work. | ||