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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).
Laboratory report on achieving a matte finish protective coating for brass switches.

Identifier  ExFiles\Box 38\6\  Scan167
Date  11th February 1919
  
R.R. 235a (500 T) (S.D. 408. 26-4-17.) Bm. 2/156/13.
X. 3424.
EFC.
February 11th, 1919.
H13/EB11219.
Laboratory.

Re Protective Coating for Brass work, with special reference to three miniture switches sent in yesterday.

In order to get a matte finish it would be best to have a matte surface on the brass before treating chemically, as this gives a more permanent coat.

I send herewith the three switches. It will be noted that two of them are slightly darker in colour than the other; this is due to the fact that they have had a longer time in the Sulphide bath. The small strips show that the polish is due to the original surface since they started on a rough surface, and therefore have a semi-matte surface on finishing.

The methods from the Autocar of your note EFC1/AT31119 were tried, but did not give good results.

We found that the surfaces as received were coated with Lacca, and this had to be removed before treatment; it would also be better if the switch knobs were threaded before fitting into the switch.

HCD
  
  


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