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).
From Mr. Royce detailing two proposals for a distributing board for electrical circuits.
| Identifier | Morton\M11\ img110 | |
| Date | 18th December 1918 | |
| To BY.{R.W. Bailey - Chief Engineer} DA.{Bernard Day - Chassis Design} & EH. from R.{Sir Henry Royce} -11- R7/G181218 Contd. Mr. Royce suggests a distributing board in the form of a hinged board hanging from the instrument board, for the purpose of inspecting connections made from the various conductor ends, to a pair of buss bars and fuses provided on this distributing board for the following circuits :- (a) Both head lights, fuse and switch. (b) Both side lights, rear lamp, fuse and switch. (c) Charging switch and fuse. (d) Klaxon connection and fuse. (e) Ignition system, connection and fuse. (f) Body lighting connection and fuse. (The switch for the body lighting would be in the interior of the body) (g) Starter control circuit, connection and fuse, and press button. There will be three switches and one press button on the face of this distributing board, for the head lamps, side and rear lamps, charging switch, and starter circuit, respectively. Generally the fuse should be on one pole and the switch on the other pole of the circuit. A Weston ammeter should be provided with central zero, reading to 20 amps each side. No voltmeter is required. An alternative to the foregoing which is thought perhaps to be less involved, is to carry a distributing box on the dashboard, and a switch box of the Bijur type (49 GB chassis) on the instrument board. (This alternative should be acted on in preference to the first proposal) This switch box would be in the form of a plate acting as a common base for the switches dealing with :- (a) Dynamo. (b) Head lamps. (c) Side and tail lamps. (d) Starter. The plate would be detached for attending to the connections and would act as the cover of a small recess or box in the instrument board, fed by a conduit containing the conductors. This box would accommodate the slack in the conductors made necessary by the switch connections being on the inside. All fuses and other connections would be referred to the distributing box on the dashboard, which would occupy a position a few inches above the top of the footboard and slightly to the left of the centre line of the car. It is desired to standardise some form of terminal end for at least the low tension conductors on the chassis. Mr. Royce stated that to effect this, the low tension wire (Contd.) | ||