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).
Parts list detailing components including steel magnet pots, oil silk diaphragm assemblies, brass rollers, and springs.
| Identifier | ExFiles\Box 148\5\ scan0292 | |
| Date | 3rd March 1938 | |
| -2- Rm{William Robotham - Chief Engineer}/JSD.8/JH.3.3.38. 2. H.P. steel magnet pots D.76043 with coils No.1788 assembled and concentric to .003". Fitted with double contact points 1458 and 1457S support blade 1809 bakelite bridge piece 1677 terminal screw and toggle spring and end cover. 2. Oil silk diaphragm assemblies incorporating, armature 1789A spindle.1790D brass plate 1783, and impact washer .010" thick to 1689. Diaphragm to consist of two layers oil silk 3 layers U5 material. 22 brass rollers to 1433A. 2 springs No.1785. | ||