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).
Letter from North & Sons Ltd. regarding damage to magneto contact breaker points caused by petrol vapour combustion.
| Identifier | ExFiles\Box 65\3\ scan0347 | |
| Date | 21th February 1929 | |
| COPY. NORTH & SONS LTD. WHIPPENDELL ROAD WATFORD. -------- Your Ref.- ROY{Sir Henry Royce}/JT5/HP. Our Ref.- HWJ/V3. 21st February 1929. Messrs. Rolls-Royce Ltd., Derby. Dear Sirs, We thank you for your letter of the 11th inst. with contact breaker No.9132 removed from an EW6 Magneto. Examination of this contact breaker shows that the damage to the platinum points is caused by the petrol or petrol vapour entering the cam cage and combustion taking place inside the cam cage. The same thing has occurred in Magneto No.100081 regarding which a separate letter has been written to you today under our reference AMA/HPB/7. The only means of preventing this is ventilation of the cam cage. We are arranging a method of ventilation which would not affect the quiet operation of the contact breaker. Our Mr North hopes to call on you early next week and will bring with him the contact breaker in exactly the same condition as it was received here, in order that you may see the carbon deposit arising from combustion in the cam cage, and at the same time will bring with him Magneto No.100081 with the cam cage ventilated in the manner we suggest. Concerning the additional lever and platinum screw referred to in your letter, we beg to say that we are readjusting the lever and sending you a new adjustable platinum screw which at the same time we are returning the adjustable screw sent with this lever which, as you will see on examination, is not of our manufacture. Yours faithfully, For and on behalf of NORTH & SONS LTD. (Sgd) C.H.Kirby. DIRECTOR. ENCLOSURE N° 694 | ||