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 'beat' note for chassis electrical horns, discussing placement issues and a potential design for a lighter twin-diaphragm horn.
| Identifier | ExFiles\Box 59\3\ Scan177 | |
| Date | 22th June 1932 | |
| X6032 PN.{Mr Northey}3/WT22.6.32. Cx.{Major Len W. Cox - Advertising Manager}...from PN.{Mr Northey} Copy to Bm. S/W. Hs{Lord Ernest Hives - Chair}/Wst. E.{Mr Elliott - Chief Engineer} By Chassis Electrical Horns. Hs{Lord Ernest Hives - Chair}/Wst1/MH.{M. Huckerby}18.6.32. Probably the "beat" note referred to in this memo would be a very useful form of signal on a car. It must be kept carefully in mind that, if a horn or two horns are arranged underneath the front apron, no part of the apron constitutes a baffle, otherwise the signal will not reach very far ahead. It occurs to one that if this "beat" note scheme is proving very encouraging it might have been worth while for the horn designers to have produced a twin instrument in which the same electro-magnet could be used with two differently tuned diaphragms. This would reduce weight and space taken up. PN.{Mr Northey} RECEIVED 1932 JUN 23 WST | ||