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 proposing a method of drying impregnated coils using forced hot air instead of a vacuum.
| Identifier | ExFiles\Box 181\M7\ img018 | |
| Date | 27th September 1912 | |
| K.{Mr Kilner} 533. (200 II) D.F. 458. 29.9.11 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 1999. (ALL COMMUNICATIONS TO BE ADDRESSED TO THE COMPANY.) OFFICES: MANCHESTER TRAFFORD PARK (Registered Office) LONDON 13 WALBROOK, LONDON, E.C. BIRMINGHAM 42 SHIRLEY ROAD, ACOCKS GREEN GLASGOW PARTICKHILL ROAD, PARTICK N.E. COAST 4 ROXBURGH TERRACE, WHITLEY BAY, NEWCASTLE-ON-TYNE CANADA 207 LUMSDEN BUILDINGS, YONGE STREET, TORONTO, ONTARIO CABLEGRAMS: SWITCH, MANCHESTER, ENGLAND. TELEPHONES: 97 & 98 TRAFFORD PARK POST OFFICE, CITY 5808. 33 ACOCKS GREEN 754 PARTICK 49 WHITLEY MAIN 240 TELEGRAMS: "SWITCH, MANCHESTER" "ROISDINAMO, LONDON" "ROYCES, ACOCKS GREEN" "ROYCES, GLASGOW" "ROYCES, WHITLEY BAY" CODE: A.B.C. 5TH EDITION. ROYCE LIMITED, TRAFFORD PARK, MANCHESTER. In Replying Please Quote FHR8/H27912. Westwood, Crowborough, sussex, 27th sept 1912. Mr J.{Mr Johnson W.M.} G.{Mr Griffiths - Chief Accountant / Mr Gnapp} Bentley, Messrs Royce Ld., Manchester. Dear Sir, With reference to your letter re dry varnishing and impregnating coils, I understand from your notes that you do not consider it a success to dry coils in a vacuum owing to the difficulty of the heat being transmitted to them, and to dry them very successfully it is necessary for them to be in a/dry atmosphere, somewhat similar I suppose to that to be found in a core oven in a foundry. It has occurred to me that to dry these coils quickly, providing the more usual vacuum is not a success, it would be possible to force air through them by standing them on a hot rectangular pipe, having steam pipes inside & holes through the top in such a way that the heated air entered the centre of the field coil, which could be covered at the top by a suitable plate and the air forced into the tube by a fan at the end. The idea is that you get a very effective system without much waste and the plenum pressure of air inside the coil would cause a rapid circulation of air in the interstices of the coil and the coil | ||