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).
Specification for the present standard H.T. Maconite covered wire.
| Identifier | ExFiles\Box 168\1\ img083 | |
| Date | 11th December 1929 | |
| X3860 11.12.29. X.3860. SPECIFICATION OF PRESENT STANDARD X.4473. H.T. MACONITE COVERED WIRE. Conductor - single. 70/.0076 tinned copper. Dielectric - Maconite only. Maximum outside diameter - .275" EFC. | ||