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 Standard Telephones and Cables Limited discussing a device for the elimination of noise in machinery.
| Identifier | ExFiles\Box 25\3\ Scan136 | |
| Date | 13th August 1926 | |
| Standard Telephones and Cables Limited FORMERLY Western Electric Company Limited. BRANCH OFFICES AND STORES: BIRMINGHAM: 14, LIVERY STREET. CARDIFF: 39, PARK PLACE. GLASGOW: 49, WEST CAMPBELL STREET. LEEDS: STANDARD BUILDINGS, CITY SQUARE. LIVERPOOL: HAY BUILDINGS, 31, NORTH JOHN STREET. MANCHESTER: NORTHERN ASSURANCE BLDGS, ALBERT SQ. NEWCASTLE-UPON-TYNE: 20, SAVILLE ROW. SOUTHAMPTON: ST.{Capt. P. R. Strong} MICHAEL'S CHAMBERS, 126, HIGH ST.{Capt. P. R. Strong} WORKS: HENDON, LONDON, N.W.9. NEW SOUTHGATE, LONDON, N.11. AND NORTH WOOLWICH, LONDON, E.16. WAREHOUSE: MANBEY ROAD, STRATFORD, E.15. REGISTERED OFFICE: CONNAUGHT HOUSE, 63, ALDWYCH, P.O. Box No. 137 LONDON, W.C.2. CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, GENERAL POST OFFICE, INDIAN, COLONIAL AND FOREIGN GOVERNMENTS. TELEPHONE. CITY 356 & 357. TELEGRAMS INLAND - RELAY, ESTRAND, LONDON CABLEGRAMS - RELAY, LONDON CODES USED: LIEBER'S 5 & 10 LETTER. BENTLEY'S 5 LETTER. A.B.C. 5TH & 6TH EDITIONS. WESTERN UNION 5 & 10 LETTER. PLEASE ADDRESS ALL LETTERS TO THE COMPANY, AND IN REPLYING REFER TO AJG/DR. YOUR REF. PN{Mr Northey}9/HW/10326. BUSH HOUSE, ALDWYCH, LONDON, W.C.2. 13th August, 1926. Messrs. Rolls-Royce, Limited. 14-15, Conduit Street, LONDON. W.1. Dear Sirs, We would refer to our conversation with your Mr. Northey concerning a device for the elimination of noise in machinery invented by H.C.Snook - No.47,299, filed U.S.A. July 30th, 1925. It was explained that this company holds the rights of an invention made by the Bell Telephone Laboratories of New York, which relates to a method of reducing noise in motor cars. Briefly the method consists of a strengthening of the surface of parts such as the walls of the transmission housing so that the surfaces have a natural period of vibration of such value that the energy required to force a vibration within the limit of audibility is greater than the energy imparted thereto by the enclosed moving parts. It was explained that this method has already been reduced to practice by the Rolls-Royce Corporation of America, and it is understood that there is every possibility of it being generally adopted in the American automobile industry. The method of eliminating noise in machinery consists in forming reinforcing ribs on surfaces subject to forced vibration whereby the frequency spectrum of such surfaces is shifted into a range of the less audible frequencies. It will be understood that the method of reducing noise results also in lighter castings having the same strength as before apart from exhibiting the higher natural periods of vibration such as could only be secured otherwise by very heavy and expensive castings. - 1 - | ||