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).
Extract discussing an instrument board clock and switch, a sample being sent, and a comparison of voltage schemes.
| Identifier | ExFiles\Box 31\1\ Scan023 | |
| Date | 15th January 1919 | |
| X.1402. Contd. X.295. es- Extract ByKO/P15.1.19. Clock, and switch in the instrument board, which allows a speedy detachment for examination, but may, in the course of time, leave the instrument a little slack, although if the springs are well made this should not actually occur, but it is one which may occur if the work turned out is poor. I am sending herewith a catalogue which will illustrate the scheme in question. We are sending you the sample switch per parcel post, and would be much obliged if, when you have examined same, you would return it to us as soon as possible. We do not consider this scheme as good as a constant voltage scheme as this latter scheme is much more beneficial in regard to increased battery life but as far as weight efficiency goes it would appear that the T & M is as good as a plain shunt wound machine for this paritcular service. By.{R.W. Bailey - Chief Engineer} | ||