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).
Suggested improvements to the Goshawk Ignition & Lighting Switch.
| Identifier | ExFiles\Box 45\4\ Scan346 | |
| Date | 6th October 1922 | |
| R.R. 199 (250T) (S.D.676 19-7-17) MP 180865 H6 RECEIVED OCT 6 1922 X4081 R.{Sir Henry Royce} C.O. E.{Mr Elliott - Chief Engineer} EFC BY2-P6.10.22. GOSHAWK IGNITION & LIGHTING SWITCH. With reference to R1/M29922 we have examined all the points referred to and are acting upon the suggestions as follows;- (1) We are raising the position of the spring blade for the press button switch by reversing the position of the blade in question with the slightest contact which will raise the spring blade another .056". (2) We are tapping the hexagon as suggested, as this is obviously an improvement. (3) We agree that the brushes are rigid, but they are of the strength selected from a number of different strengths instructed by the D.O. We are, however, increasing the number of blades to 5 instead of 3, and maintaining the same present total thickness of material. At the same time we are increasing the set up on the blades slightly. (4) Sheet metal terminals. We already have an instruction on the drawing that these are to be annealed after bending - we will see that this is actually carried out. (5) The black enamel chipping. We would like to recommend that instead of engraving through the enamel on to the white metal base, we should engrave before blacking and fill up with a zinc oxide white, which sets very hard, and is impervious to oil and other liquids. It gives a permanent white appearance and is actually the material used by the Lucas Co. in filling in the engraving for their name on their Switchbox, which I think you will agree gives a good appearance. If you will agree to this white lettering, which retains its color far more permanently than the nickel silver exposed by the engraving does, we think the trouble would disappear. We find that it is necessary to bake the enamel hard in order to obtain wearing qualities. The Lucas Co. and the Cambridge Instrument people confirm that this is their experience, as well as ourselves. contd. | ||