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 the performance and limitations of a new dual-arm screen wiper.
| Identifier | ExFiles\Box 167\5\ img033 | |
| Date | 29th January 1932 | |
| REGISTERED OFFICES & GENERAL DEP'TS GREAT KING STREET, BIRMINGHAM LONDON OFFICE & SHOWROOMS 319, REGENT STREET, W. 1. X6119. HS{Lord Ernest Hives - Chair} 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 - 12, STEVENSON ST.{Capt. P. R. Strong} GORGIE. GLASGOW - 227/229 ST GEORGE'S ROAD. LEEDS - 64, ROSEVILLE ROAD. LIVERPOOL - 45C/45D EDGE LANE. LONDON - DORCRECHT 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 X/LGT16. 29th January 1932. Messrs. Rolls Royce Limited, DERBY. WST See me Hs{Lord Ernest Hives - Chair} For the attention of Mr. H.E.West. Hs{Lord Ernest Hives - Chair} Dear Sirs, R.W. SCREENWIPER. We thank you for your letter of the 27th and in reply have the following comments to make. As previously mentioned this new dual arm R.W. Screenwiper has been designed to give an average wiping speed of 28 complete cycles per minute (that is, of course, 56 wipes to and fro per minute). In our experience a higher wiping speed than this seems to be somewhat confusing to the driver, but we certainly have not had the experience you will have had at really high speeds of 70/80 m.p.h. We note that you are of the opinion that the wiper should wipe every half second, and from this we take it that you would require 60 complete cycles per minute. You will appreciate that such a speed would necessitate a complete re-design of our gear-box and motor. The latter, of course, would have to be capable of 100% more power than the present one. Over and above this the problem of noise becomes very greatly aggravated with an increase in speed and power, to such an extent that our present gear-box would be entirely unsuitable. With regard to the effect of wind pressure at high speeds, we have had a certain amount of experience in this at speeds of 60/65 m.p.h. and found that the problem is satisfactorily catered for by considerably increasing the pressure of the wiping blade on | ||