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 Joseph Lucas Ltd. discussing a wiring scheme for Wind Tone Horns.
Identifier | ExFiles\Box 59\3\ Scan354 | |
Date | 15th October 1935 | |
HEAD OFFICES & WORKS: GREAT KING ST.{Capt. P. R. Strong}, BIRMINGHAM. CONTRACTORS TO THE ADMIRALTY, WAR OFFICE, AIR MINISTRY, INDIA OFFICE, G.P.O. AND LEADING RAILWAYS. [Handwritten Note: 46066] JOSEPH LUCAS LIMITED GREAT KING STREET BIRMINGHAM 19 TELEPHONE: NORTHERN 5201 (12 LINES) TELEGRAMS & CABLES: "LUCAS, BIRMINGHAM" "KING OF THE ROAD" LAMPS, HORNS. "CYCLEALITIES", "MOTOR-CYCLEALITIES", "MOTORALITIES", MAGNETOS, BATTERIES. ELECTRIC LIGHTING & STARTING SYSTEMS. Codes: A.B.C. 5TH & 6TH EDITs & BENTLEY'S 1ST & 2ND. SERVICE DEPÔTS BELFAST 3/5, CALVIN STREET. BIRMINGHAM, 18 GREAT HAMPTON STREET. BRIGHTON, 4 85, OLD SHOREHAM RD., HOVE. BRISTOL 345, BATH ROAD. CARDIFF 54a, PENARTH ROAD. COVENTRY PRIORY STREET. DUBLIN PORTLAND STREET NORTH, NORTH CIRCULAR ROAD. EDINBURGH, 11 60, STEVENSON RD, GORGIE. GLASGOW 227/229, ST GEORGE'S ROAD. LEEDS 64, ROSEVILLE ROAD. SERVICE DEPÔTS LIVERPOOL, 13 450/456, EDGE LANE. LONDON DORDRECHT ROAD, ACTON VALE, W.3. LONDON 757/759, HIGH ROAD, LEYTON, E.10. LONDON 319, REGENT ST.{Capt. P. R. Strong}, W.I. SHOWROOMS & OFFICES. LONDON 155, MERTON ROAD, WANDSWORTH, S.W.18. MANCHESTER, 3 291/293, DEANSGATE. MANCHESTER TALBOT RD, STRETFORD. NEWCASTLE-ON-TYNE, 2 64/66, ST MARY'S PLACE. Messrs. Rolls-Royce, Limited., DERBY. WHEN REPLYING PLEASE REFER TO X/R3 15th. October, 1935. Dear Sirs, Your reference...Hs{Lord Ernest Hives - Chair}/Wst.2/MA. Further to our telephone conversation of yesterday regarding the suggested wiring scheme, for the Wind Tone Horns. As mentioned to you we are trying out your suggested diagram and will let you know any day now how this works out. In the meantime, however, we should like to say that several schemes were originally tried out by us in order to obtain the most effective and we have been into the matter fairly thoroughly. The trouble we anticipate may arise from your proposed scheme is that you will not get a staccato loud note when operating the loud push. The reason for this is that when switching on the loud push, both relays will be energised instantaneously and the resistance will be inserted in the circuit momentarily. This will possibly upset the instantaneous loud note effect. We have avoided this occurring with the present arrangement by reducing the ampere turns of the one coil on the second relay which is in series with that of the first relay, so that it is not sufficiently strong to pull down the armature and separate the pair of contacts itself. The pair of contacts shorting the resistance are only opened by the heavier coil on the second relay after the points of the first relay have closed. As we say we will get in touch with you again, as soon as we have tried out your particular layout. Yours faithfully, JOSEPH LUCAS LIMITED. [Signature] Technical Sales Department. | ||