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).
Letter from British Insulated Cables Ltd discussing the specifications for a Twin Ignition Cable and proposing an alternative construction.
| Identifier | ExFiles\Box 167\3\ img065 | |
| Date | 11th June 1937 | |
| 6110 TELEGRAMS: LIMITED, "HELSBY." TELEPHONE Nº 66. WORKS: PRESCOT AND HELSBY. HEAD OFFICE: PRESCOT, LANCS. TELEGRAMS: "INSULATOR, PRESCOT." TELEPHONE Nº 6571 PRESCOT. TEN LINES - PRIVATE BRANCH EXCHANGE. British Insulated Cables Ltd. Makers of B.I. CABLES Manufactures: ALUMINIUM. SHEETS & SECTIONS. BOXES. JOINT, SERVICE, NETWORK. CABLES. FOR ALL ELECTRICAL PURPOSES. COMMUTATOR BARS. COMPOUNDS. CONDENSERS. STATIC. COPPER. STRANDS & SECTIONS. FLEXIBLES. FUSE BOXES. KNIFE SWITCHES. METERS. OVERHEAD EQUIPMENT. RAILWAY, TRAMWAY, LIGHT & POWER. PER PINIONS. PILLARS & KIOSKS. RAIL BONDS. VARNISHES. WELDERS. ELECTRIC. WIRE. ALUMINIUM. COPPER. COTTON COVERED. ENAMELLED. SILK COVERED. FUSE. TROLLEY. WIRING SYSTEMS. Messrs. Rolls-Royce, Ltd., DERBY. HELSBY, NEAR WARRINGTON. PLEASE ADDRESS THE COMPANY AND REFER TO EAB/FJ. Ref. LR{Mr Ellor}/Wst.3/AP. 11th. June, 1937. Dear Sirs, We have noted the remarks contained in your letter of the 7th. inst. You do not mention how you will fix off the ends of the Twin Ignition Cable and we consider that it might be advisable to give consideration to same. The thickness of dielectric on Unisheath 7 is actually .021" radial plus a radial thickness of Cab Tyre Compound of .050". Halving the thickness of dielectric would mean that we should be unable to apply such a thin dielectric and be safe. Would you consider using a Round Twin Flexible each conductor 40/.0076" insulated with Vulcanised Rubber C.M.A. 250 volt grade, twisted together, wormed & sheathed with Cab Tyre Rubber, Varnished Cambric Taped & Braided with .0076" Tinned Copper Wires? Under separate cover we have sent you a sample of the flexible suggested, but without the Varnished Cambric Tape & Copper Wire Braid, and should appreciate your further views on this matter. We are willing to make you a sample 100 ft. length of cable when we have fixed up the details of the flexible. Yours faithfully, British Insulated Cables Limited. E.{Mr Elliott - Chief Engineer} A.{Mr Adams} Bayles Works Manager- Helsby. SN.{Mr Sanderson}O. | ||