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 to Klaxon Ltd. regarding bench tests on an electric windscreen wiper due to operational trouble.
| Identifier | ExFiles\Box 59\3\ Scan234 | |
| Date | 3rd March 1933 | |
| x6075' C. to DA{Bernard Day - Chassis Design}/EV.{Ivan Evernden - coachwork} c. to Hn.{F. C. Honeyman - Retail orders} c. to JLE.{J. Lee Evans - Chassis Test Manager} Hs{Lord Ernest Hives - Chair}/Wst.8/MA. March 3rd., 1933. Messrs.Klaxon Ltd., Warwick Road, Greet, Birmingham. Dear Sirs, Klaxon Electric Wind-Screen Wiper. Owing to a certain amount of trouble having been experienced with the operation of your Model T8082 12 volt wind screen wiper on our chassis, we have carried out bench tests on a wiper in order to ascertain:- (a) Temperature rise under low conditions. (b) Current consumption. (c) Noise of operation. etc. The wiper was run working at 34 strokes per minute for 17 1/4 hrs. This condition was estimated to be the condition of the wiper when the screen was covered with snow such as was experienced on one of your wipers recently on the Continent with and Expl. chassis. The motor carcase attained a tempera of 117C when run under this condition. This temperature was attained with the motor clamped to a wooden strut and running on a 12 volt battery in which the applied voltage was gradually falling. Obviously if the battery had been on charge attaining its maximum voltage of 17.5, the temperature would have been considerably increased. We consider this temperature of 117C, to be excessive and in some instances dangerous not only to the windings of the motor and solder on the commutator, but also to the chassis body work itself. | ||