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).
Test results for Maconite Chassis H.T. Ignition Cable samples.
| Identifier | ExFiles\Box 52\1\ Scan142 | |
| Date | 14th March 1930 | |
| X4473. EFC. {E. Fowler Clarke - Electrical Engineer} 14.3.30. X.3860. MACONITE CHASSIS H.T. IGNITION CABLE. X.4473. Six samples of the above submitted for test from production have successfully withstood 19,300 volts R.M.S. for 30 mins. after previous immersion in water for 24 hours at atmospheric temperature. EFC {E. Fowler Clarke - Electrical Engineer} /HEW. | ||