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 detailing the dispatch and specifications of six type LR7 Voltage Regulator Units.
| Identifier | ExFiles\Box 166\2\ img049 | |
| Date | 16th November 1936 | |
| JOSEPH LUCAS LIMITED GREAT KING STREET BIRMINGHAM 19 TELEPHONE : NORTHERN 5201 (12 LINES) TELEGRAMS & CABLES : "LUCAS, BIRMINGHAM." 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 SERVICE DEPOTS BELFAST 3/5, CALVIN STREET, MOUNT POTTINGER. 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.{Capt. P. R. Strong} GEORGE'S ROAD. LEEDS 64, ROSEVILLE ROAD. LIVERPOOL, 13 460/466, 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. SUPPLY DEPOT MANCHESTER TALBOT RD, STRETFORD. NEWCASTLE on TYNE, 2 64/66, ST MARY'S PLACE. Handwritten: 6092 WST WHEN REPLYING PLEASE REFER TO X/LGT.10. Messrs.Rolls-Royce Limited, Derby. 16th.November,1936. For the attention of Mr.West. Dear Sirs, We are despatching to you under separate cover, 6 Voltage Regulator Units, our type LR{Mr Ellor}7, three of these are Thermostatic controlled Regulators, and three are insensitive., Regulators. In all cases the Regulators have been mounted on to our RF50 Control Box. The Thermostatic Regulators are fitted with 38 ohm. Field Parallel resistances, and 63ohm. points resistance, this value of points resistance being chosen to prevent "running away" of the dynamo, at speeds below 6750 r.p.m. The regulators have been set with a C45PV two-pole Dynamo at 1500 R.P.M. With regard to the three "Insensitive" Regulators that is, by the choice of suitable spring and magnetic characteristics, and the use of a bucking winding connected across the field of the dynamo, the change of voltage setting due to contact wear, has been rendered small in the order of 0.1-0.25 Volt/ thousandth, also here again a field parallel resistance of 38ohms, and a point resistance of 63 ohms is incorporated. On the attached sheet, we give Technical Details of these Regulators, that is the connections of the control box, and the open circuit voltages, settings at 1500 R.P.M. etc. for your guidance. | ||