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 showing open circuit volt-speed and short circuit ampere-speed curves for B.T.H. and Watford magnetos.
| Identifier | ExFiles\Box 48\2\ Scan349 | |
| Date | 23th November 1925 | |
| X8996 WATFORD, NO 73970. B.T.H. NO 356147 B.T.H. NO 356071 VOLTS AMPERES OPEN CIRCUIT VOLT-SPEED AND SHORT CIRCUIT AMPERE-SPEED CURVES OF PRIMARY WINDINGS OF B.T.H. FM6. AND WATFORD Eobd MAGNETOS. VOLTS ____ AMPERES - - - SPEED r.p.m. 36860 23-11-25 Y-Axis Labels: VOLTS S.C. AMPERES Y-Axis Scale (left): 14, 12, 10, 8, 6, 4, 2, 0 Y-Axis Scale (right): 3.5, 3.0, 2.5, 2.0, 1.5, 1.0, .5, 0 X-Axis Scale: 0, 400, 800, 1200, 1600, 2000, 2400, 2800, 3200, 3600 | ||