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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).
Instructions detailing the operation of a valve with a filament and plates.

Identifier  WestWitteringFiles\N\2October1925-December1925\  Scan135
Date  29th June 1920
  
RR 238 (150 BKS.) (SH57.29-6-20.) MP 224358

ROLLS-ROYCE LTD.

INSTRUCTIONS.

19

To

Order No.

Customer's No. 6

would be 33 1/3 % and 4 1/2 % respectively.

When lighted a horizontal coil filament can be seen inside the valve, with a plate on either side lying (though not very accurately) in planes parallel with it.

Apparently when the filament reaches a certain temperature, arcs are automatically struck between the filament and each plate, the latter being connected, one with each resistance and dealing one with each half wave of the alternating current. Hence the valve is provided

(Contd)

Signed

This Sheet must be filed on completion of the work.
  
  


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