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).
Instructions detailing the discoloration of a wire at various temperatures, from 200°C up to 320°C.
| Identifier | ExFiles\Box 69\1\ scan0238 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (OB 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (2) To____________________19___ Order No. WD{Mr Wood/Mr Whitehead}81 (contd) Customer's No.__________________ a glass thermometer. In this case the temperature measured when the cotton charred (ie) blackened was 320°C. The wire was observed to be slightly discoloured at 200°C, brown at 240°C and dark brown at 280°C finally turning black at 320°C (approx). Signed H.E.W. This Sheet must be filed on completion of the work. | ||