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 concerning the valve used for Peak Voltage measurement.
| Identifier | ExFiles\Box 60\2\ Scan077 | |
| Date | 28th January 1932 | |
| REGISTERED OFFICES & GENERAL DEP'TS GREAT KING STREET, BIRMINGHAM LONDON OFFICE & SHOWROOMS 319, REGENT STREET, W.1. X6094. TRADE MARK JOSEPH LUCAS LIMITED ELECTRICAL DEPARTMENT WELL STREET BIRMINGHAM TELEPHONE: NORTHERN 5201 (12 LINES) TELEGRAMS & CABLES: 'LUCAS, BIRMINGHAM' LUCAS 'KING OF THE ROAD' LAMPS LUCAS STARTING & LIGHTING EQUIPMENT FOR CARS, LUCAS LIGHTING EQUIPMENT FOR MOTOR CYCLES, LUCAS MAGNETOS, LUCAS BATTERIES SERVICE DEPÔTS BELFAST 3/5, CALVIN STREET, MOUNT POTTINGER. BIRMINGHAM GREAT HAMPTON STREET. BRIGHTON OLD SHOREHAM RD. HOVE. BRISTOL 345, BATH ROAD. CARDIFF 54A, PENARTH ROAD. COVENTRY PRIORY STREET. DUBLIN PORTLAND STREET NORTH, NORTH CIRCULAR ROAD. EDINBURGH 32, STEVENSON RD. GORGIE. GLASGOW 227/229 ST. {Capt. P. R. Strong} GEORGE'S ROAD. LEEDS 64, ROSEVILLE ROAD. SERVICE DEPÔTS LIVERPOOL 450/456 EDGE LANE LONDON DORDRECHT ROAD, ACTON VALE, W.3 LONDON 759, HIGH ROAD, LEYTON, E.10. LONDON 319, REGENT ST. {Capt. P. R. Strong} , W.1. SHOWROOMS & OFFICES. LONDON 155, MERTON ROAD, WANDSWORTH, S.W.18. MANCHESTER 291/293, DEANSGATE. SUPPLY DEPOT. MANCHESTER TALBOT RD. STRETFORD. NEWCASTLE-on-TYNE 64/66, ST. {Capt. P. R. Strong} MARY'S PLACE. WHEN REPLYING PLEASE REFER TO EAW/EE 28th January 1932. HS {Lord Ernest Hives - Chair} 29/1/32 Messrs. Rolls-Royce Limited, DERBY. Dear Sirs, Your reference ....... Hs {Lord Ernest Hives - Chair} /Wst.2/AD In reply to your letter of the 26th. we would inform you that the valve we employ for our Peak Voltage measurement is a Mullard VU.50. We are not quite sure whether this valve is obtainable at the present time, but doubtless you will be able to get an equivalent type. Generally, we are not ourselves, in favour of calibrated spark gaps for accurate work. Even the ionised type shew a very considerable variation in voltage between individual sparks, while the unionised type are, of course, useless, owing to their high impulse ratio. Yours faithfully, JOSEPH LUCAS LIMITED. ELECTRICAL DEPARTMENT. WST | ||