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).
Table outlining experimental insulation material changes for various electrical components.
| Identifier | ExFiles\Box 39\3\ Scan152 | |
| Date | 31th August 1921 guessed | |
| EXPERIMENTAL INSULATIONS FOR ELECTRICAL UNITS. Place. No. | Name. | Present material. | Proposed material. BALLAST F.7343-4 | Washers. | Mica. | Bakelite-dilecto. F.7354. | Bush. | Micanite. | Bakelite-dilecto. F.7345. | Washer. | Mica. | Bakelite-dilecto. F.7893. | Washer. | Micanite. | Bakelite-dilecto. ACTUATOR. F.7051-2 | Plates. | Ebonite. | Bakelite-dilecto. F.7054-5 | Washers. | Presspahn. | Bakelite-dilecto. F.6710 | Washers. | Presspahn. | Bakelite-dilecto. F.7269. | Plate. | Ebonite. | Bakelite-dilecto. G.4288. | Washers. | Presspahn. | Bakelite-dilecto. G.4287. | Tubes. | Paper. | One each bakelite-dilecto rod, and bakelite rod (Swiss) MAIN SWITCH. E.12965. | Plate. | Vulcasbestos. | Continental Bakelite. E.12955. | Washer. | Micanite. | Bakelite-dilecto. E.12953. | Washer. | Micanite. | Bakelite-dilecto. E.12948. | Washer. | Vulcasbestos. | Bakelite-dilecto. E.12956 | Tube. | Ebonite. | Continental Bakelite. E.12957. | Tube. | Ebonite. | Continental Bakelite. E.12961. | Core washer. | Presspahn. | Bakelite-dilecto. E.12970. | Core tube. | Manilla paper. | Bakelite rod (Swiss) F.6710 | Core washer. | Presspahn. | Bakelite-dilecto. F.6711. | Core washer. | Presspahn. | Bakelite-dilecto. | ||