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).
Test report on a new pair of Lucas horns, type WT.22, detailing their performance.
| Identifier | ExFiles\Box 167\1\ img055 | |
| Date | 9th November 1936 | |
| To E.{Mr Elliott - Chief Engineer} c. to By.{R.W. Bailey - Chief Engineer} c. to Cx.{Major Len W. Cox - Advertising Manager} H6116. Rm{William Robotham - Chief Engineer}/Wst.1/CB.9.11.36. Re New Type Lucas Horns. Type WT.22. We have now tested a pair of horns received from Messrs. Lucas made up in Zinc Base Alloy castings, black enamelled. These horns are not representative in external finish of what they propose to send to us as a production article, but were only sent for us to obtain an idea of their performance. The following table gives the performance of these horns:- TYPE WT.22 | ALTO | TREBLE. --- | --- | --- WEIGHT. | 4 lbs. 6 ozs. | 4 lbs. 4 ozs. PITCH. | D | F CURRENT CONSUMPTION AT 12 V.{VIENNA} | 3-4 amps. | 3 amps. LOWEST VOLTURE OF OPERATION. | 4 volts. | 4 volts. PERFORMANCE ON 16 VOLTS. | Satisfactory. | Unsatisfactory | ||