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 standardisation tests of Lucas WT horns for various chassis models.
Identifier | ExFiles\Box 59\3\ Scan324 | |
Date | 23th May 1935 | |
By.{R.W. Bailey - Chief Engineer} From Hs{Lord Ernest Hives - Chair}/Wst. _6032 Hs{Lord Ernest Hives - Chair}/Wst.5/MA.23.5.35. LUCAS WT HORNS. In accordance with Sales request we are carrying out standardisation tests on these horns with a view to fitting them ultimately to the 20/25 & SpectreCodename for Phantom III chassis. It is not proposed to fit these horns to the Bentley chassis at present owing to their increased weight. We have a pair fitted to SpectreCodename for Phantom III 1 chassis running quite satisfactorily and we shall be glad if you will instruct the necessary scheme for a pair of these horns to be fitted to chassis 21.G.IV for the 10,000 miles test. We understand that there is a scheme already in existence for fitting these horns to a 20/25 chassis the scheme originally being prepared for Mr.Geoffrey Smith's chassis. Regarding the fitting of the relay switch which Messrs.Lucas recommend with these horns, we have discussed the question very fully with their Mr.Thacker and at their Laboratory at Birmingham. Whilst we agree that the current consumption of the horns is more than the standard horns we are now fitting we consider that our horn push will deal with this extra current and we therefore propose to carry out our experiments without the relay switch allowing the horn push to carry the whole current. On Messrs.Lucas's original scheme they provide for a loud and soft tone for town and country use but whilst we were at Messrs.Lucas we demonstrated that the use of the high note only in town was quite effective the double horns being used for country use only. If the results of our tests indicate that our horn button successfully carries the extra current we propose to standardise these horns without the use of Messrs.Lucas relay switch as the fitting of this relay switch involves more wiring and additional fittings at the front of the chassis. Ha/Wst. | ||