Rolls-Royce Archives
         « Prev  Box Series  Next »        

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).
Letter to Joseph Lucas Ltd. proposing a new relay switching scheme for car horns.

Identifier  ExFiles\Box 59\3\  Scan351
Date  5th October 1935
  
Horns
86066

Hs{Lord Ernest Hives - Chair}/Wst.2/MA.
5th October, 1935.

Messrs.Joseph Lucas, Ltd.,
Great King Street,
BIRMINGHAM, 19.

For the attention of Mr.W.E.Robinson.

Dear Sir,

Confirming our telephone conversation we now send you herewith a wiring diagram illustrating a scheme which we have evolved for the relay switching of the Lucas W.T. horns, by which it is made possible for the horns to sound loud when the push switch is squarely depressed, i.e. when banged in emergency.

On your existing scheme when the switch is depressed in this way, i.e. working loud and soft tones simultaneously the horn sounds soft, also if the horn button is pressed on the soft side and then rocked over to loud it still sounds soft. We consider this to be detrimental to the efficient operation of the horns on high speed cars.

Will you please let us have your comments on this new scheme and whether you can make up for us an experimental relay switch as quickly as possible for test. We should also like to know whether it is possible to make this scheme exclusive to Rolls-Royce & Bentley cars.

Yours faithfully,

FOR ROLLS-ROYCE LIMITED.
  
  


Copyright Sustain 2025, All Rights Reserved.    whatever is rightly done, however humble, is noble
An unhandled error has occurred. Reload 🗙