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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).
List of components for a Vibration Amplitude Indicator.

Identifier  ExFiles\Box 137\4\  scan0033
Date  6th September 1929
  
X 634.
6.9.29.

VIBRATION AMPLITUDE INDICATOR.

Components :-

Vibration potentiometer of R.R. design and make.
Weston type 375. galvanometer, full scale deflection about 600 μa
R.R. ignition condenser in parallel with same.
40 volt H.T. dry battery.
2 volt L.T. battery.
Length of triple flex, together with
Volt amplitude amplifier and indicator comprising :-

One 2 volt D.E.6. Osram valve.
One 2 " D.E.2.H.F. " "
Two standard valve holders.
One 300,000 ohm Dubilier Duwirohm resistance.
Holder for same.
One 10 megohm Dubilier Dumetohm resistance.
Holder for same.
One .05 m.f. Dubilier type B.775. condenser.
One 3 point switch, or the equivalent.
Terminals.

EFC.
  
  


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