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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).
Typed memo discussing the replacement of the obsolete rotary Klaxon horn with alternatives from Robert Bosch or Luvax for the L.H. Phantom II model.

Identifier  ExFiles\Box 64\3\  scan0304
Date  1st August 1930
  
COPY.

HORNS.

August 1, 1930.

Dear Sg.{Arthur F. Sidgreaves - MD},

In reply to Sg{Arthur F. Sidgreaves - MD}15/D30.7.30 I have had a word with Rm.{William Robotham - Chief Engineer} about Horns for L.H. P.II.

First: It was generally agreed by all at Derby that the rotary Klaxon was obsolete and should be replaced.

Second: In discussing a substitute the Robert Bosch buzzer horn without the two-tone feature was agreed as being acceptable by R.R. Ltd. and R.R.A.I. Its foreign origin makes it undesirable to R.R. Ltd. if a satisfactory British substitute can be obtained.

Third: By.{R.W. Bailey - Chief Engineer} is working with Luvax to produce a buzzer horn as good as the R.{Sir Henry Royce} Bosch.

Therefore R.R.A.I. stand to accept either the R.{Sir Henry Royce} Bosch or an English substitute. And the final agreement can only be reached after demonstration on 25-EX.

It should be made clear however that the rotary horn is not acceptable both because of harsh tone and necessity for lubrication and adjustment.

(Sgd.) Oy.
  
  


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