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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).
Improvements to the Bijur lubrication system, replacing soldered joints with nut and sleeve connections.

Identifier  ExFiles\Box 27\1\  Scan268
Date  22th July 1929
  
To DA.{Bernard Day - Chassis Design} from Hs{Lord Ernest Hives - Chair}/Gy.

Hs{Lord Ernest Hives - Chair}/Gy.1/22.7.29.
x3806

RESTRICTING UNITS ON
BIJUR LUBRICATION.
-------------------

In reply to DA.{Bernard Day - Chassis Design}1.N/18.7.29., we sent samples of the plugs in question and a 'T' joint to Mr. Royce.
Would it be possible for you to examine them ?.
From the attached sketches received today you will see that no soldered joints whatever are necessary any longer on the piping and that the 'T' joints are neatly accomplished with a nut and sleeve. You will appreciate the enormous advantage gained in service when it is only necessary to remove a single pipe by undoing two nuts, over the present method of removing several unions from their respective drip-plugs and then bending the pipe line.

You will have noticed that numerous complaints have been made on the 10,000 mile test relative to broken soldered joints.

We have carried out tests of long duration to establish whether this was due to vibration of the pipe lines etc., but the pipe itself more frequently fractured than the solder, especially after changing to 50/50 Tin Lead Solder Alloy from the standard 60/40., thereby increasing the maximum tensile stress of the solder.

We think you will also agree that the job can be even neater with these smaller plugs (N.B. how much smaller the drip-plugs are) than at present, and will not stand out
  
  


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