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).
Technical memo discussing design and performance of a driving spindle, condenser, and low tension contact maker.
| Identifier | WestWitteringFiles\G\June1921\ Scan39 | |
| Date | 21th June 1921 | |
| To R.R. of America Inc. from R.{Sir Henry Royce} -4- R2/G21/6/21 Contd. driving spindle suits the Bosch equipment contact maker and the good bearings we provide for this spindle are available for carrying the cam for the contact maker. This shaft appears so well supported that I have passed the arrangement as being the best we can apply quickly, as there seems to be no means of avoiding this at the present. You will notice in the drawing that we send you that we have suggested a larger spigot at the bottom of the sleeve used for the advance, which we think could give greater satisfaction by providing larger wearing surfaces, and so maintain concentricity better and longer. Condenser. X.4275. X.2512 Regarding the condenser, we are a little bit surprised that this is effective, Mr. Clark having informed us that all the plates should be very close to the connections (and not have to wander along a great length of tinfoil) This we understand, is how it is carried out in magnetos in which the break contacts appear to last so well. In the ignition fitted to 4 EX. there is a quantity of black material which has oozed out of the condenser, which makes one wonder whether the condenser is quite reliable in construction. Oil inside the Apparatus. X.4275 There is also a large amount of oil flying about inside the apparatus. So far, however, it does not seem to have affected the working. This will be watched. Low Tension Contact Maker. X 4275 X. 1819 X 2894 Regarding the rocker, this has the rather serious defect of being very difficult to remove in case the points are out of order. It should be rendered much easier, as is done in the Delco. We have noticed so far that the points of this appear to be tungsten, and shew only slight signs of destruction. (Contd.) | ||