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 table for low tension wire required per Phantom II chassis.
| Identifier | ExFiles\Box 59\1\ Scan004 | |
| Date | 14th May 1930 | |
| X.7561 Low tension wire required for P.II. (per chassis). Core size | Completed diameter (ins). | Colour | Length (ft) ---|---|---|--- 84/25 | .425 | Black | 20 | 50 90/36 | .200 | Red | 25 | 60 - | .200 | Black | 35 | 80 - | .200 | Red & Black | 25 | 60 - | .200 | Blue & White | 30 | 70 40/36 | .187 | Green | 50 | 110 - | - | White | 30 | 70 - | - | Blue | 15 | 40 - | - | Black & White | 20 | 50 23/36 | .145 | Orange | 20 | 50 Handwritten note: Recd 14-V-30 | ||