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).
The bench testing of two Klaxon buzzer horns, models S.21098 and S.21099, for cars.
| Identifier | ExFiles\Box 59\3\ Scan083 | |
| Date | 21th November 1930 | |
| X6074 By.{R.W. Bailey - Chief Engineer} from EFC. c. Hs{Lord Ernest Hives - Chair}/AJL. EFC3/AD21.11.30. X.1163b. KLAXON BUZZER HORNS FOR CARS. Two of the above horns Nos. S21098/9 representing the makers latest type have recently been received for test. The following bench observations quoted from my assistant's report AD.73 have been made of these two horns :- S.21098. Insulation O.K. on 200 volts a.c. Coil resistance 1.265 ohm. Current to just break contacts 3.2 amperes. Will operate quietly on 7 volts. Running current on 12 volts 1.6 amperes. Pitch 300 vibrations per second. Intensity, not so loud as the Bosch. The quality may be described as shriller and less voluminous. S.21099 Insulation O.K. on 200 volt a.c. Coil resistance 1.27 ohms. Current to just break contacts 3.4 amperes. Will operate quietly on 7 volts. Running current on 12 volts 1.6 amperes. Pitch, 300 vibrations per second. Intensity and quality similar to S.21098. The general impression of these horns is that they are a well finished job. We are handing them over for fitting to experimental cars. EFC. | ||