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).
Internal instruction memo regarding the properties and application of Armacell varnish compared to Asbestic varnish.
| Identifier | ExFiles\Box 24\2\ Scan173 | |
| Date | 21th September 1921 | |
| R.R. 258 (300 Bks.) (SF 152. 6-11-18.) MP 197880 ROLLS-ROYCE LIMITED. INSTRUCTIONS. To: Mr Clarke Order No Customer's No. With reference to your Memo on Varnishes X1109 Please note that armacell is a Varnish which should be baked. This we always do otherwise it would be of no use to us apparently asbestic varnish is an Air Drying like Paragon. Consequently you would get different results unless you have really baked the armacell before the test was taken. I think probably Asbestic varnish would be good for our Spark Coils & if you have a coil to spare I would like to try it. Signed E J Brock This Sheet must be filed on completion of the work. | ||