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).
Defining the standard lengths of H.T. test leads for various ignition tests.
| Identifier | ExFiles\Box 52\1\ Scan143 | |
| Date | 15th March 1930 | |
| X4473 EFC. {E. Fowler Clarke - Electrical Engineer} 15.3.30. X.4473. X.4436. H.T LEADS USED FOR VARIOUS IGNITION TESTS. We have now fixed upon the following standard lengths of H.T. test leads based on the maximum lengths as shown on the drg. Chassis magneto tests - 4 feet leads. Aero " " - 6 feet plain " "(shielded) - 6 feet braided. Chassis B.I. tests - 5 feet leads. EFC {E. Fowler Clarke - Electrical Engineer} /HEW. | ||