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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).
The production testing procedures for push button switches.

Identifier  ExFiles\Box 34\3\  Scan034
Date  26th August 1919
  
To Ry. from EFC.
c. to Bn.{W.O. Bentley / Mr Barrington}
c. to Wor.{Arthur Wormald - General Works Manager}
c. to Wor.{Arthur Wormald - General Works Manager} for Mr. Brock.

X.2641

EFC5/T26.8.19.

X.2641 - PUSH BUTTON SWITCHES.
X.1647

Regarding the production testing of electrical apparatus generally, we are making satisfactory progress with the various items which require testing, and we have Mr. Watson of Mr. Brock's Dept. watching this work, and gaining experience with us of the various tests which we carry out. We wish, however, to pass over the various items in succession to the Department which will be responsible for this work. This will best be done item by item as the necessary equipment and apparatus become available. At the moment, the only item to which this can apply is the push button switch. We give below the information that is required for these particular pieces, and we shall be glad if Mr. Bailey will arrange that no more of these, after a certain number (of which we would like to be informed) shall be sent to us.

We have already given sheets on which the clearances which we recommend for this switch have been set out, and we would like to point out that only two of these clearances are really independent quantities and therefore it is only really necessary to make measurements of two. The two which it is most easy to measure are (1) Depression of button to cause carbon contact (2) Copper gap when carbons are just in contact.

The first of these may be measured by connecting up the switch in series with a cell and pea lamp, and placing a micrometer

Contd.
  
  


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