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 S. Smith & Sons regarding the performance and testing of a Dynamo and Cutout.
| Identifier | ExFiles\Box 3\5\ 05-page071 | |
| Date | 22th May 1919 | |
| X.295. CONTRACTORS TO ADMIRALTY, WAR OFFICE & AIR BOARD Telephone: MAYFAIR 6350 (6 lines) Code: A.B.C. 5th Edition Telegrams: SPEEDOMET, TELEW, LONDON. S·SMITH & SONS (M·A) LTD MANUFACTURERS OF MOTOR ACCESSORIES. Branches at NEW YORK · PARIS · CAPE TOWN JOHANNESBURG · PORT ELIZABETH DURBAN · EAST LONDON · MELBOURNE SYDNEY · WELLINGTON · BANGKOK SOURABAYA Agencies in all civilized countries And at 122, ALMA ST.{Capt. P. R. Strong} BIRMINGHAM 12, JACKSONS ROW, DEANSGATE MANCHESTER Factories: CRICKLEWOOD, ACTON & CAMBERWELL SPEEDOMETER HOUSE, 179-185, Gt Portland St.{Capt. P. R. Strong} London. W.1 Our ref: HJS/LML Your ref: RWR/T 22nd. May 1919. Messrs. Rolls-Royce Ltd., Nightingale Rd., DERBY. Dear Sirs, We beg to acknowledge receipt of your letter of the 19th inst., and thank you for the particulars which the letter gives of the test of our Dynamo which you have carried out. We note you are returning to us the smaller of the Dynamos, and the Bezel Switchboard; these will, of course, be credited to you as soon as they arrive. We note that you intend to keep the larger of the Dynamos and the Cutout. In regard to the question of weight and bulk of the Cutout; Our Electrical Engineer states that when a Cut-out is made too small, and has insufficient winding space, the shunt winding heats up making the Cut-out late in cutting in, and thus nullifying in part the advantage obtained by using a Dynamo with a low cutting in speed. The saving in weight which can be effected, in any case, is only a few ounces. We have made careful note of the whole of your report regarding the behaviour of the Dynamo. We do not think, however, that the machine that you have tested represents the best that we can do by any means. We are carrying out further experiments with an armature | ||