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).
The properties and stability of a varnish sample under various test conditions.
| Identifier | ExFiles\Box 24\2\ Scan252 | |
| Date | 29th June 1920 | |
| RR 238 (T50 WKS.) (SH57. 29-6-20.) MP 224356 ROLLS-ROYCE LTD. INSTRUCTIONS. To____________________________________ 19__ Order No._________________ Customer's No. 2 at 100°C. Above this it turned a deep yellow which was permanent on cooling. Absorption. A sample was weighed, soaked in water for 100 hours and re-weighed. The increase in weight (of the varnish alone) was 24.5%. The varnish was left permanently lighter in colour. Solubility. The varnish was not visibly affected by 48 hours immersion in engine-oil, or by 24 hours in petrol. Chemical Stability. Pink stains were made by drops of strong sulphuric acid and brown stains by nitric acid when left for some minutes; but no violent actions occurred. Signed (Coutts) This Sheet must be filed on completion of the work. | ||