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).
Expressing concern over changing from silver soldering to ordinary solder for the ballast resistance.
| Identifier | ExFiles\Box 168a\5\ img053 | |
| Date | 7th February 1931 | |
| Y7720. BY2/G.7.2.31. EFC. Scty/Mr. Brock. BY/RD. X.7720 BALLAST RESISTANCE. -------------------------- I do not feel that the running of one car represents sufficient experience to justify us departing from the use of silver soldering the ballast resistance wire to its terminal and adopting in its place the use of ordinary solder. If this part were to fail it means the ignition is out of commission, and personally I do not see why we should take this risk in any case, and certainly not until all the experimental cars fitted in this manner have performed satisfactorily for a reasonable length of time. We note from past experience that what appears to be perfectly safe on one car is entirely wrong when it comes to bulk. BY.{R.W. Bailey - Chief Engineer} | ||