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 report on volt-drop in the headlamp circuit.
| Identifier | ExFiles\Box 167\1\ img211 | |
| Date | 2nd November 1937 | |
| To By/RD. from Rm{William Robotham - Chief Engineer}/RC.{R. Childs} 6116 Rm{William Robotham - Chief Engineer}/RC.{R. Childs}7/MH.{M. Huckerby}2.11.37. RE VOLT-DROP IN HEADLAMP CIRCUIT. We have now completed a test in which the dipping mechanism in the headlamp was disconnected, and a variable resistance connected in its place. With the side, tail and dipped head lamp on, and a current in the dipper circuit equal to the estimated initial current in the series winding of the mechanism, as given by the makers, the following observations were made :- TEST 1. ( Current in dipper circuit - 18 amps. ( Volts at battery terminals - 11.8 volts. ( Volts at junction box dipper terminal in lamp - 7.9 volts. TEST 2. ( Current in dipper circuit - 17.8 amps. ( Volts at battery terminals - 11.8 volts. ( Volts at junction box dipper terminal in lamp - 8.0 volts. Rm{William Robotham - Chief Engineer}/RC.{R. Childs} | ||