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).
Graph of short and open circuit ampere/volt-speed curves for the primary windings of Watford and B.T.H. aero magnetos.
| Identifier | ExFiles\Box 43\4\ Scan238 | |
| Date | 25th April 1930 guessed | |
| X4021 SHORT CIRCUIT AMPERE-SPEED AND OPEN CIRCUIT VOLT-SPEED CURVES OF THE PRIMARY WINDINGS OF WATFORD AND B.T.H. AERO MAGNETOS O.C. VOLTS S.C. CURRENT (AMPERES) SPEED r.p.m. VOLTS AMPERES B.T.H. TYPE SC12-7B No. 11012. WATFORD TYPE SP{Mr Spinney}12-2. No. 85/B2. NEWBOLD & HOWARD LD. EALING W.5. Axis values: Vertical (O.C. VOLTS): 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28 Vertical (S.C. CURRENT): .5, 1.0, 1.5, 2.0, 2.5, 3.0 Horizontal (SPEED r.p.m.): 0, 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600 | ||