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).
Specification detailing the electrical operating conditions and resistance values for two circuits, including an actuator box and main switch.
| Identifier | ExFiles\Box 64\3\ scan0035 | |
| Date | 5th March 1925 guessed | |
| -2- Contd. Allowing 11 volts supply, the operating current would be 20.3 amperes. The conditions of correct operation as regards this first circuit will therefore be :- (a) The actuator box must be capable of doing all that is required of it with a current of 17 amperes through its coils. Since the No. of turns of these coils is 140 (17 SWG) the minimum ampere turns to work the apparatus must be say 2,400. (b) With a current of 17 amperes through the teazer, main and armature windings of the motor in series, the motor must be certain of turning (slowly) in all circumstances. (c) 22 Amperes of current must be capable of passing through the top contacts with no unsatisfactory result. Circuit 2. MAIN SWITCH The functioning of the actuator box completes the final connection to earth of circuit 2. This circuit consisting only of the main switch coil with the non-inductive resistance in parallel, is supplied through the push button switch. The supply voltage may be considered to be 10 1/2. The resistances are as follows :- Main switch coil 3.80 ohms. Parallel non-inductive resistance 9.83 " Compounded resistance 2.74 " 10 1/2 VOLTS The amperes at 10.5 volts through the main switch coil will be 2.77. Contd. | ||