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).
The specifications and mounting instructions for a regulator and its resistance unit.
| Identifier | ExFiles\Box 166\2\ img010 | |
| Date | 17th September 1935 guessed | |
| -4- REGULATOR. Resistance unit. This unit is composed of 26 S.W.G. Eureka wire wound non-inductively on a non-metallic tube. It should be ascertained that the wire is in sound condition throughout its length and that no break is likely to occur, particularly at the terminal screws. Any break or loose connection in this unit may cause serious damage to the regulator contacts. The total value of the resistance, measured between its terminals, should be such that when a current of .5 ampere is passed through it, the P.D. across the resistance should be 7.5 -.2 volts i.e. the resistance should be 15.0 -.4 ohms. Regulator. In mounting the regulator, care should be taken to ensure that the two screw caps, one at each end carrying a terminal, are not unduly knocked or stressed. Each cap carries a contact, and any distortion of this part may upset the adjustment of the contacts, and consequently the operation of the regulator. | ||