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).
Clarifying the specifications for switchboxes used with the auto charge control switch.
| Identifier | ExFiles\Box 65\2\ scan0036 | |
| Date | 9th September 1929 | |
| X7730 Ey/RD. from EFC. {E. Fowler Clarke - Electrical Engineer} EFC {E. Fowler Clarke - Electrical Engineer} 1/AD19.9.29. X.4008. AUTO CHARGE CONTROL SWITCH AND X.7730. SWITCH BOXES FOR USE THEREWITH. X6096 We have noted that you have instructed the long distribution board incorporating the auto charge control switch in your Ey/RD9/N11.9.29 which does not appear to include the instruction for the special switchbox with extended armature contact, and no M in the first position of the switch, i.e. of the type considered right for operation with the auto charge control switch. These switchboxes should differ in a minor detail only from the type of S.S. switchbox considered more suitable for present standard namely, the one with M & B in the first position and with extended armature contact as originally instructed for the S.S. our ref.EFC {E. Fowler Clarke - Electrical Engineer} 2/AD8.7.29. EFC. {E. Fowler Clarke - Electrical Engineer} | ||