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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).
Technical letter detailing the procedure for correcting a vehicle's gauge.

Identifier  ExFiles\Box 61\3\  scan0148
Date  17th December 1930
  
Messrs.Rolls-Royce,Ltd., Date 17.12.30. Page 4

correct the gauge.

With your present installation, which incorporates a pump, the pump can of course be used for this correction, so that the car may be rapidly made ready for tests or for a customer to take away without the necessity of emptying the tank.

If this rubber pipe is a long one, and is taken right round the car to the proximity of the instrument on the dash-board, the gauge can be corrected by the mouth, watching the fluid in the dash unit to see that too great a pressure is not exerted and the gauge blown during this procedure.

By this method the gauge can be blown up to within a ¼ to ½ a gallon of its correct reading, it being almost impossible to get full correction, as air is being introduced down the vent tube, and not underneath the bell, which takes place immediately the car goes on the road.

This latter point is easily demonstrated to any one servicing the gauge, as a quick method of re-establishing a reading when the air line has been uncoupled.

We enclose a short piece of the tubing which we use experimentally for this work. (With gauge set).

It would greatly assist us at some future date if we could have a sample tank for accurate calibration, and to
  
  


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