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).
Instructions and observations on vehicle electrical system tests, including potential readings at various points.
| Identifier | ExFiles\Box 168b\2\ img220 | |
| Date | 1st December 1924 | |
| RR 239 (150 BKS.) (09 461-9 12-24) MP 906975 ROLLS-ROYCE LTD. INSTRUCTIONS. To _________ Order No. _________ Customer's No. 2 _________19__ Potentials to earth at various points | | @ 60 w (dr) | 48 w (e) | 96 w + ign | |--- |--- |--- |--- | | Battery Terminals | 12.1 | 12.1 | 14.0 .9 | | Main fuse | 11.5 .3 | 11.9 .2 | 13.9 .2 | | Headlamp fuse | 11.4 .4 | 11.6 .3 | 13.7 .2 | | Headlamps | 10.7 .7 | 11.0 .6 | 12.7 1.0 | (The battery had discharged slightly for the second list). The dynamo was run at a speed such as to deliver 15.0 amperes plus ignition with no lights on. It then delivered a surplus of 1.0 ampere with lights on. Readings at the fuses named in neither case included the fuses themselves. The footswitch Terminals are not accessible without disconnecting. The following observations were made on 14 EX:- Signed _________ (Cont'd) This Sheet must be filed on completion of the work. | ||