Graph comparing the Volt-Speed and Ampere-Speed curves for the primary windings of various magnetos.
| Identifier | ExFiles\Box 65\3\ scan0208 | |
| Date | 26th October 1921 | |
| X7791 O.C. VOLTS. 22 20 18 16 14 12 10 8 6 4 2 0 S.C. AMPERES. 3.0 2.5 2.0 1.5 1.0 .5 0 SPEED r.p.m. 0 400 800 1200 1600 2000 2400 2800 3200 3600 R. {Sir Henry Royce} BOSCH FU6R No 31859. VOLTS WATFORD EW6 No 99171. AMPERES. OPEN CIRCUIT VOLT-SPEED AND SHORT CIRCUIT AMPERE-SPEED CURVES OF PRIMARY WINDINGS OF WATFORD EW6, LUCAS ER6, AND BOSCH FU6R MAGNETOS H.C.W. 26-10-21 | ||
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).