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).
Brochure from The Macintosh Cable Co., Ltd. detailing the properties of 'MACONITE' insulating material.
| Identifier | ExFiles\Box 168\1\ img012 | |
| Date | 12th January 1926 guessed | |
| The Macintosh Cable Co., Ltd. ELECTRICAL CABLE MAKERS, ENGINEERS & CONTRACTORS. Paper Insulated Cables, Vulcanised Rubber Cables and Wires, Vulcanised Bitumen Cables, Lighting Flexibles, Telephone Cables, Joint Boxes, Sac Cells, &c. DERBY Ashbourne Road Mills, Telegrams: "Macintosh," Derby, 1260. LIVERPOOL. 176, 178, Rice Lane, Walton. Telegrams: "Ouadrivox," Walton, 73. LONDON. Astor House, Aldwych, W.C.2. Telegrams: "Izolinist, Estrand, London." Holborn 2514 & 2515. BRANCH OFFICES. LONDON. "Anberley House," Norfolk Street, Strand. W.C.2 Telegrams: "Gillesando," Gerrard 2309 & 4709. MIDLAND. 75, Empress Road, Derby. WEST OF ENGLAND. 6, Park Row, Bristol. Telegrams: "Conductor," Bristol 1088. MANCHESTER. Cambridge Street, Manchester. Telegrams: "Meantime," Central 7447. NEWCASTLE. 26, Mosley Street, Newcastle. Telegrams: "Macaible," Central 3812. YORKSHIRE. 9, Park Square, Leeds. Telegrams: "Macintosh," Leeds 25727. SCOTLAND. 47, Waterloo Street, Glasgow. Telegrams: "Simpatica," Glasgow. IRELAND. 5, South Anne Street, Dublin. "MACONITE" is the trade name of a special insulating compound for Electric cables. It possesses some remarkable properties which have not previously been found in combination in any one substance, and Cables insulated with “Maconite” have been used for some years by the principal Railway Companies in this country in long tunnels where corrosive fumes and fluids are always present. "Maconite" is a high-grade insulating material, providing great resistance to electrical stress. It was produced after years of research to overcome the difficulties inherent in other forms of insulation. "Maconite" is the toughest and most resilient insulating or sheathing known. It is non-hygroscopic, chemically and physically stable, and is unaffected by extremes of temperature. "Maconite" Insulated Cables will not decentralise, will not 'creep,' and may be bent with safety to acute angles. For many years attempts have been made to reactiv robust compounds so as to get increased mechanical strength and elasticity without sacrifice of insulating properties. Also many attempts have been made, both by the design of special coverings and modification of the structure of the rubber itself, to obtain immunity from the attack of acids and alkalies. From a study of the recorded cases of cable deterioration, it will be realised that the first requisite is that the cable covering, insulating or external, shall be absolutely non-hygroscopic. It is, of course, preferable that the insulating material itself should have these properties in addition to a high degree of dielectric resistance. In spite of statements to the contrary, it is well known that no vulcanised rubber has yet been produced which fulfils this requirement in its entirety. The difficulty of this problem is discussed at length in C. J.{Mr Johnson W.M.} Beaver's classic paper on 'Cables,' read before the Institution of Electrical Engineers in December, 1914. In this paper the author states that with the vulcanised rubbers, in ...voltages according to the B.E.S.A. cables. | ||