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 on the winding and sealing of a primary and secondary coil using waxed paper and bitumen.
| Identifier | ExFiles\Box 61b\4\ scan0121 | |
| Date | 8th December 1924 | |
| RR 238 (150 BKS.) (DB{Donald Bastow - Suspensions} 461-8-12-24) MP 306975 ROLLS-ROYCE LTD. INSTRUCTIONS. (3) To.......................................................19 Order No........... Customer's No........... The primary is wound with 21 SWG enamelled wire and the secondary 40 SWG enamelled wire. Both windings are paper insulated throughout, three layers of .0015" waxed paper insulating each secondary layer. U.S.A. Bosch follow usual American practice by running a bitumen or pitch sealing compound into the metal coil case to seal the coil into position. Signed H.E.W. This Sheet must be filed on completion of the work. | ||