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).
Procedure for plating, including solution parameters and post-treatment instructions.
| Identifier | ExFiles\Box 132\4\ scan0238 | |
| Date | 16th October 1939 guessed | |
| (2) Plating is carried out as follows :- Solution - Chromic Acid 250grammes/litre. Sulphuric Acid 0.037N. Temperature - 53/55°C. Current - 600 amps. Time - 30 minutes. Afterwards the assembly is removed from the vat, the jig disconnected and the block thoroughly washed in running water, particularly the water passages. It is then dried off in boiling water and the bores are immediately wiped with a cloth soaked in neat soluble cutting oil, to prevent rust. H1/EA. | ||