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 Limited regarding the modification of dynamo field coil resistance.
| Identifier | ExFiles\Box 166\2\ img242 | |
| Date | 17th January 1939 | |
| 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. 'KING OF THE ROAD' LAMPS, HORNS. 'CYCLEALITIES' 'MOTOR-CYCLEALITIES'. 'MOTORALITIES' MAGNETOS, BATTERIES, ELECTRIC LIGHTING & STARTING SYSTEMS. Codes: A.B.C. 5th & 6th EDITn & BENTLEY'S 1st & 2nd JOSEPH LUCAS LIMITED GREAT KING STREET BIRMINGHAM 19 TELEPHONE: NORTHERN 5201 (12 LINES) TELEGRAMS & CABLES: 'LUCAS, TELEX, BIRMINGHAM' SERVICE DEPOTS BELFAST 51/53, UPPER LIBRARY ST.{Capt. P. R. Strong} BIRMINGHAM, 16 GREAT HAMPTON STREET. BRIGHTON, 4 85, OLD SHOREHAM RD., HOVE. BRISTOL 345, BATH ROAD. CARDIFF 54A, PENARTH ROAD. COVENTRY PRIORY STREET. DUBLIN 6, DAWSON STREET, NORTH. NORTH CULIAR ROAD. EDINBURGH, 11 60, STEVENSON RD. GORGIE. GLASGOW 223/229, ST GEORGES ROAD. LEEDS 64, ROSEVILLE ROAD. SERVICE DEPOTS LIVERPOOL, 13 45D/45E, EDGE LANE. LONDON DOR{Mr Dorey}ÉCROFT ROAD, ACTON VALE, W.3. LONDON 757/759 HIGH ROAD, LEYTON, E.10. LONDON 319, REGENT ST.{Capt. P. R. Strong}, W.1. SHOWROOMS & OFFICES LONDON 112A, JUNCTION ROAD, WANDSWORTH, S.W.18. MANCHESTER, 3 291/293, DEANSGATE. MANCHESTER TALBOT RD, STRETFORD. NEWCASTLE-ON-TYNE, 2 64/66, ST MARY'S PLACE. 6092 WHEN REPLYING PLEASE REFER TO X/LCT/6. 17th.January,1939. Messrs.Rolls-Royce,Limited, D E R B Y. For the attention of Mr.Child. (Experimental Dept.) Dear Sirs, In answer to your letter of the 14th.instant, reference Rm{William Robotham - Chief Engineer}/RC.{R. Childs}5/JH, addressed for the attention of our Mr.C.E.Robinson, we note that you have modified the Field Coils on your large Dynamo and increased the resistance of the total winding to about 7 ohms, as compared with 6.25 ohms. Your query as to whether this will affect the operation of the C.A.V. Voltage Regulator and of the Lucas regulator mounted on the R.R.1 Unit, we would inform you that 7 ohms resistance will be satisfactory for both types of regulators; we fix 6 ohms as the bottom limit of resistance - actually a higher resistance is an advantage unless the inductance is made abnormally high. Trusting this information will clear this point satisfactorily for you. Yours faithfully, JOSEPH LUCAS LIMITED. Technical Sales Dept. | ||