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 Royce Limited discussing the specifications of a transformer and insulating materials.
| Identifier | ExFiles\Box 32\4\ Scan039 | |
| Date | 19th January 1921 | |
| R.R. 886A (100 T) (S.H) 798. 10-12-20) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 2947 X.1581 ROYCE LIMITED. Trafford Park, Manchester. January, 19th 1921. Messrs. Rolls-Royce Ltd., Nightingale Road, Derby. X.1581 X.1109 Dear Sirs, The writer must apologise for not answering previously your letter of the 30th ulto, your reference Hy{Tom Haldenby - Plant Engineer}5/DB{Donald Bastow - Suspensions}/30.12.20, but absence from business and the resulted conjection, has been the cause of the delay. The small Transformer which we have in use here, is a very crude and simple Transformer which enables us to step up a primary voltage of 350 to a maximum voltage of approx. 3300. The secondary being wound in 3 sections so that we can obtain approximately 1000 to 1100 volts, 2000 to 2200 volts and the third step 3300 volts maximum. As you surmise, the capacity of the apparatus is small, in fact it does not exceed 2 K.W. consequently has been low in cost, and the risk in operating is comparatively small. It is also very economical from the fact, that only a comparatively small iron core composed of iron wire is used, and therefore the magnetising losses are small. We think you will obtain a small Transformer of such capacity and of good design from the British Electric Transformer Co. Ltd. Hayes, Middlesex, or from Ferranti Ltd., Hollinwood. We have found that until now the maximum of 3300 volts has been sufficient for general work, but if we have need at any time to replace this transformer, we should certainly make provision for a maximum voltage of 5000 volts as we find it would be useful for testing samples of insulating material. x 763. Whilst mentioning Insulating material we would say that we have come across a rather good Varnish made by the Asiatic Varnish Co. 37 Garners Lane, Stockport, and I am taking the liberty of sending a small sample under separate cover addressed to Mr. Haldenby, and hope you will see that it gets into the hands of the correct people at your end. Contd. | ||