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 Ampere-Pull curves for a cut-out shunt coil, comparing standard and increased iron circuits.
| Identifier | ExFiles\Box 168a\3\ img144 | |
| Date | 21th January 1935 | |
| CURVES SHOWING AMPERE-PULL OF R.R. CUT OUT OUT (SHUNT COIL ONLY) PULL IN OZS. (PULL ARMATURE OFF POLE) AMPERE TURNS ON COIL INCREASED IRON CIRCUIT STD. IRON CIRCUIT L.B. 21.1.35 | ||