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).
Best practices for arranging and color-coding circuits in radio diagrams.
| Identifier | ExFiles\Box 64\3\ scan0063 | |
| Date | 30th January 1926 | |
| Contd. -2- EFC4/T30.1.26. brought to the minimum possible. It is often the fault in many of the radio diagrams which are published that it is very difficult to disentangle these. In a general way, they should always be arranged (and this applies also to other diagrams) that the conductor at datum potential of the system should be represented at the bottom (this you have done on Lec.2194), but in addition to this, in a general way the wires and points at higher potential in relation to datum should be higher, so that the current may be considered to be pumped up from datum level (potential) at the bottom and allowed to fall down again through the various circuits back to datum. We think it would be better to represent the complete heavy current circuit with heavy black lines and the auxiliary circuits in the order in which they operate, in colours, the three colours adopted being (1) Red - for the teazer circuit. (2) Yellow-for the main switch operating circuit. (3) Green - for the final hold-off circuit. This we have represented on the diagram which is now sent to you. EFC. | ||