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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).
Page two of a letter from The Houdaille Hydraulic Suspension Company detailing a design change to their suspension system.

Identifier  ExFiles\Box 25\2\  Scan011
Date  12th March 1914
  
R.R. 295a (150 H) (V.{VIENNA} V.{VIENNA} 681 12-3-14) G.{Mr Griffiths - Chief Accountant / Mr Gnapp} 0414.

-2-

The other change is in the method of preventing the liquid passing through the hole in the fixed shutter on the recoil of the Car Springs; as shown in the diagrams, this is done by the blocking of this hole on the reverse side by a piece of thin steel spring, but there was a pro-bability - although it is very true very rare - of this spring not being effective. This steel spring has now been done away with and a ball prevents the liquid passing on the recoil of the Car Springs.

I may add that the working parts are made of a specially treated steel having a resistance of 70 Kilos to the square centimeter.

If of any interest to you, I would send you down a section, if you could let me have it back again within 24 hours.

Awaiting your reply,

Yours faithfully,

THE HOUDAILLE HYDRAULIC SUSPENSION COMPANY.

(signed) D.C.Defries.

MADE AT CROXLEY
  
  


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