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 manganin wire specifications and voltage settings for an electrical switch.
| Identifier | ExFiles\Box 65\2\ scan0156 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) NP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. To Order No. Customer's No. 2 ...............19 manganin, compared with 157 1/4 ft. and 49 ft respectively given on the drawing. The setting given to the switch was such that points close at about 16.5 v cold. This would make them close at about 16.8 v when warm. The points re-open at about 8.0 volts. Signed J.U. This Sheet must be filed on completion of the work. | ||