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 of recommended changes to insulation materials for various electrical components.
| Identifier | ExFiles\Box 39\3\ Scan145 | |
| Date | 23th August 1921 guessed | |
| -3- RECOMMENDED CHANGES OF INSULATION IN ELECTRICAL UNITS. BALLAST. Piece No. Name. Present matl. Proposed Material. F.7343-4 Washers Mica Bakelite dilecto, gd.A. F.7354 Bush Micanite " " F.7345 Washer Mica " " F.7893 " Micanite " " ACTUATOR. F.7051-2 Plates. Ebonite. } Bakelite micarta (paper) F.7058 Washers. Presspahn. } or Bakelite dilecto XX. F.6710 " " " F.7269 Plate. Ebonite. " G.4288 Washers. Presspahn. " G.4287 Tube. Paper " MAIN SWITCH. E.12965 Plate. Vulcasbestos. Continental Bakelite or B-micarta (duck base) E.12955 Washer. Micanite. Bakelite-dilecto XX E.12953 " " OR Bakelite-micarta (paper). E.12948 " Vulcasbestos. " E.12956 Tube. Ebonite. " E.12957 " " " E.12961 Cone washer. Presspahn. " E.12970 Cone tube. Manilla paper. " F.6710 Cone washer. Presspahn. " F.6711 " " " PUSH BUTTON G.5534 Plug. Red Fibre. Bakelite Linen-red. | ||