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).
List detailing the colour coding for lines in a light-calling system.
| Identifier | ExFiles\Box 176\2\ img168 | |
| Date | 1st August 1940 | |
| FILE IN CLAN FOUNDRY FILE. August 1940 Colours of lines to Rm{William Robotham - Chief Engineer}'s light-calling system. 0. WHITE . SW. FEED. 1. BLUE. SECRETARY. 2. BLACK & WHITE. TYPIST. 3. RED & BLACK. OFFICE BOY. 4. GREEN. Rm{William Robotham - Chief Engineer}/FJH.{Fred J. Hardy - Chief Dev. Engineer} 5. YELLOW & ORANGE. Rm{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} 6. GREEN & BLACK. AA.{D. Abbot-Anderson} (Blue and White. (Brown spares.) | ||