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).
Test observations on a Bentley car fitted with a Lucas electrical harness, measuring voltage and current.
| Identifier | ExFiles\Box 168\1\ img313 | |
| Date | 30th November 1938 guessed | |
| OBSERVATIONS MADE ON A BENTLEY CAR FITTED WITH LUCAS HARNESS. Test 1. With engine stationary, and H.C. and T lamps only on - (a) Volts at battery terminals 11.95 volts. (b) " head-lamp terminals 9.8 " (c) Battery current Discharge 11.3 amperes. Test 2. With engine running at a speed high enough for dynamo to supply load and balance the battery, and with H.C. and T lamps, ignition coil and petrol pumps only on - (a) Volts at battery terminals 12.45 volts (b) " regulator terminals D and E 13.0 " (c) " head-lamp terminals 12.1 " (d) Battery current. Zero Test 3. With conditions as in Test 2, but with the engine and dynamo running at a speed above regulating point - (a) Volts at battery terminals. 12.9 volts. (b) " regulator terminals D and E 14.2 " (c) " head lamp terminals. 13.3 " (d) Battery current Charge 6.5 amperes. .................. | ||