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).
Continued report discussing the performance and reliability of various cutout instruments, specifically the Smith cutout and No.7914.
| Identifier | WestWitteringFiles\F\April1921\ Scan90 | |
| Date | 18th April 1921 | |
| Contd. -3- EFC4/T18.4.21. falls just within our limit, whereas the other instrument under the same temperature condition is later than the limits we specify. In every case the reverse series amperes to deoperate are well within our limit and this small value taken in conjunction with the fact that the deoperating voltage with battery disconnected is considerably less than the operating voltage, would seem to point to there being more series turns in these cutouts than is usual. Altogether, however, we consider that the operation of the Smith cutout leaves very little to be desired in reliability and consistency of operation, and especially, as shown by these figures, if the cutout be made with half of its shunt resistance of copper and half of Eureka wire. We are of the opinion at the moment that this particular cutout No.7914 represents the most suitable cutout for the F.R. car that we have ever yet had. (The Bleriots not so far having shown themselves to be consistently good). EFC. | ||