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).
Standardisation of two Lucas H.F.722 electric horns secured to headlamp pillars.
| Identifier | ExFiles\Box 171\2\ img086 | |
| Date | 15th September 1932 | |
| RR 78B (10M) (30405. 21-4-32) BM. 3/8382.4. COMPLETED 20.3.33 STANDARDISATION of CHASSIS PARTS. Description of Parts. TWO LUCAS H.F.722 ELECTRIC HORNS SECURED TO HEADLAMP PILLARS. Origin. To improve road clearing at high speeds. Experimental Test Report. These horns are arranged a whole tone out of pitch with each other and are wired together. The result is a double strength beat note, extremely penetrating. Road Test Report. A pair of these horns have run 10,000 miles on 19-EX with excellent results. Weight of Old Part. Cost of Old Part. £ 1. 4. 4. Weight of New Part. Cost of New Part. £ 2. 9. 0. Difference per Car. Difference per Car. £ 1. 4. 8. Increase. Cost of Parts in Works which will be scrapped if commenced on:- Series............£......... Series............£......... Series............£......... Signature from Cost Dept. that above is correct. G/Rb.{R. Bowen} 13.3.33 G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 14.3.33 [Stamp: ANTONY] Date 15.9.32. X No. 6032. Drawing No. Part List INITIAL | DATE | REMARKS SG.{Arthur F. Sidgreaves - MD} | 15.3.33 | Agreed Sg.{Arthur F. Sidgreaves - MD} R.{Sir Henry Royce} | 14/9/32 | I agree. JHR but don't like harsh noises & much prefer the Bosch I have on. 16/9/14. #R WOR.{Arthur Wormald - General Works Manager} | 15.9.32. | Agreed Wor.{Arthur Wormald - General Works Manager} C. | 16.8.32. | Agreed C. however the would does not seem to agree with me. R RG.{Mr Rowledge} | 24.9.32. | Agreed Rg.{Mr Rowledge} DA.{Bernard Day - Chassis Design} | 20.9.32. | Agreed Da.{Bernard Day - Chassis Design} BY.{R.W. Bailey - Chief Engineer} | 18.9.32. | Agreed BY.{R.W. Bailey - Chief Engineer} EP.{G. Eric Platford - Chief Quality Engineer} | 19.9.32. | Agreed EP{G. Eric Platford - Chief Quality Engineer} & MX.{John H Maddocks - Chief Proving Officer} E.{Mr Elliott - Chief Engineer} | 22.9.32. | Agreed AE. PN.{Mr Northey} | 19.9.32. | Agreed PN.{Mr Northey} HS.{Lord Ernest Hives - Chair} | | Agreed Hs.{Lord Ernest Hives - Chair} | ||