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).
Experimental testing of car electrical system faults and specific earthing issues.
| Identifier | ExFiles\Box 61\2\ scan0494 | |
| Date | 21th September 1928 | |
| EFC. ) FROM R.{Sir Henry Royce} HS.{Lord Ernest Hives - Chair} } PY. } C. to BJ. WOR.{Arthur Wormald - General Works Manager} DA.{Bernard Day - Chassis Design} E.{Mr Elliott - Chief Engineer} Y 2515 R1/M21.9.28. CAR ELECTRICAL EQUIPMENT. X7780 X7740 Have you experimentally demonstrated all sorts of faults on the electrical system of our cars, such as accidental earths anywhere, to test efficiency, and the way the fuses blow, even to an earth on the starter motor circuit, and a disconnected battery, and whether we ought to have say a 200 amp. fuse on the battery earth wire, or + to starter motor. On 12-G.4 the spot light mounted on the windscreen has not an effective earth, and lights up when the R.H. door is closed only, but I think this is not the whole story. I have proved it to be want of reliable frame connection. R.{Sir Henry Royce} | ||