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 The Telegraph Condenser Company regarding the properties and suitability of a supplied brown wax for use in condensers.
| Identifier | ExFiles\Box 165\5\ img134 | |
| Date | 18th October 1934 | |
| The Telegraph Condenser Company Limited. PHONE: ACORN 0061 (5 Lines). GRAMS: "TELEFARAD, ACT. LONDON" CODE: BENTLEYS. DIRECTORS: LORD EBBISHAM, G.B.E. E.{Mr Elliott - Chief Engineer} H.{Arthur M. Hanbury - Head Complaints} F.{Mr Friese} REEVES. S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} BROWN, F.R.S. Mrs. A.{Mr Adams} S. G.{Mr Griffiths - Chief Accountant / Mr Gnapp} BROWN. W. J.{Mr Johnson W.M.} COLE, (MANAGING) Wales Farm Road, North Acton, London, W.3. YOUR REF OUR REF JHC/SK. 18th October 1934. Messrs. Rolls-Royce Ltd., DERBY. Dear Sirs, In reply to your letter of the 9th October, we would say that the brown wax which we supplied to you has not a sharply defined melting point but softens at about 180°F.{Mr Friese} and flows at about 220°F.{Mr Friese} We do not use this wax for impregnating condensers but only as a filling compound to seal up the condenser unit in its container. The wax contains a quantity of metallic stearates and although we think that coil windings impregnated with it would be quite unharmed for a considerable period, we feel that there is just the possibility of a chemical action occurring when the wax is in contact with copper across which there is a comparatively high potential gradient. We therefore feel that the wax should not be used for the impregnation of coil windings without exhaustive tests to ensure that no such action does occur. Yours faithfully, THE TELEGRAPH CONDENSER COMPANY LTD. Technical Department. HS{Lord Ernest Hives - Chair} / WSC{W. S. Cassel} 46052 ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY. | ||