Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Improvement, cost, and manufacture of coils in response to a memo from 'R'.

Identifier  ExFiles\Box 164\5\  img031
Date  21th January 1931
  
Copy. X. 6058

To Wor.{Arthur Wormald - General Works Manager} EJB/EG21.1.31

I thank you very much for giving me the opportunity of ready R's memo which I return herewith. This is most interesting to me and I am pleased to be able to say that all the precautions he mentioned are being taken.

You will remember having gone to the expense of buying a new impregnating plant for this job. However, I do not think R.{Sir Henry Royce} knows how much we have improved our coil during the last twelve months. Perhaps this is because the alterations have taken place in the Works. We have not had one of our new type coils broken down yet, and we have made somewhere about 1,500. All the coils in the quarterly reports are of the old type, and I expect every one of that type of coil will come back sooner or later. The method of construction was wrong.

It seems that someone is making a point of the cost of the fine wire we use because we wind the secondary outside the primary. I think the cost is somewhere about 8d as against perhaps 4d. What we are mainly concerned with is producing a good coil, and I still think that if we are given an equal quality of insulation and wire our present coil is second to none.

You will be interested to know that I am trying to modify my coil case moulds so that I can bring the cost of this, the most expensive piece on the job, down to less than half. You will also be interested to hear that every modification we have made to the coil has not only made it better, but also cheaper to manufacture. This is right as you will remember telling me some time ago.

I do hope that R.{Sir Henry Royce} knows the full facts about our coil, and if it would interest him or anyone else for that matter I would be very pleased to supply every detail of the coil in its various stages of manufacture. I am not afraid of anyone's criticism. R's remarks are most interesting because we never get any help like he can give. It is very gratifying to me to know that we have already tackled this job on the lines he has suggested.

I do not think there will be any need to reduce the spark gaps quite as low as R.{Sir Henry Royce} suggests if they get better running with the large one, although I think .030 is rather high. It must be distinctly understood that the old coil will not do this but I have every confidence in the new one, providing as I said before, we can get good insulation. It is possible we shall have to get this from U.S.A..

E.J. Brock.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙