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).
Oscillograms showing the current through the primary circuit of a Wraith ignition coil, comparing two types of distributors.
| Identifier | ExFiles\Box 164\5\ img410 | |
| Date | 27th February 1938 | |
| WRAITH IGNITION COIL. OSCILLOGRAMS SHOWING CURRENT THROUGH PRIMARY CIRCUIT OF COIL. Veh 3. AMPS 2.0 1.5 1.0 0.5 0. A.{Mr Adams} B. DELCO - REMY DISTRIBUTOR. 2 REVS [ENGINE]. ROLLS ROYCE DISTRIBUTOR. CIRCUIT USED. CONTACT BREAKER. C. P. S. 3.5" GAP. DEFLECTION COILS. SGL. 27/2/38. | ||