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 detailing proposed material changes for experimental electrical insulation units.
| Identifier | ExFiles\Box 24\2\ Scan206 | |
| Date | 1st November 1934 | |
| X.1109- ISSUE G.34-2140. NOV.34 EXPERIMENTAL INSULATIONS FOR ELECTRICAL UNITS. | Piece. No. | Name. | Present material. | Proposed material. | |--------------|--------------|-------------------|-----------------------------------------------------------------| | BALLAST | | | | | F.7343-4 | Washers. | Mica. | Bakelite-dilector. | | F.7354. | Bush. | Micanite. | " | | F.7345. | Washer. | Mica. | " | | F.7893. | " | Micanite. | " | | ACTUATOR. | | | | | F.7051-2 | Plates. | Ebonite. | " | | F.7054-5 | Washers. | Presspahn. | " | | F.6710 | " | " | " | | F.7269. | Plate. | Ebonite. | " | | G.4288. | Washers. | Presspahn. | " | | 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. | " | " | " | | E.12948. | " | Vulcasbestos. | " | | E.12956 | Tube. | Ebonite. | Continental Bakelite. | | E.12957. | " | " | " | | E.12961. | Core washer. | Presspahn. | Bakelite-dilecto. | | E.12970. | " tube. | Manilla paper. | Bakelite rod (Swiss) | | E.6710 | " washer. | Presspahn. | Bakelite-dilecto. | | F.6711. | " | " | " | | ||