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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).
Supply and fitting of instruments, proposing which parts should be supplied by America vs. England.

Identifier  ExFiles\Box 19\3\  Scan338
Date  10th May 1930
  
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(b) The K.S. Petrol gauge has no balance pipe and no pump.
(c) The fixing and wiring of the instruments is not up to R.R. standard. The clock will possibly be for 8-volts.

We would suggest the following arrangement.

America to supply :-

(a) The speedometer, because they need one of a special type and this we believe is not part of the chassis.
(b) The clock, because it also is an extra. If it must be an electrically operated clock we should have great difficulty in getting R's approval of any such clock but if we do not supply over here the question does not arise.

England to supply :-

Petrol gauge, ammeter, oil gauge, thermometer, red lamp, main switch, starter switch and mag. testing switch

These are all needed for testing the chassis over here and in most cases have been made specially to our own specification and are part of the standard chassis.

We also suggest that the instruments should be back fitting into a die cast aluminium frame supplied with the chassis. The instruments would have glasses and be held into the frame by a few communal spring loaded clamps. The frame would be screwed to the back of the instrument board which is provided by the coachbuilder and is treated in any way he may choose. We are preparing a design on these lines.

We think that the fixing of the instruments on the American car very out of date. The instruments are fastened into the metal frame by 2 BA. set screws in aluminium, and all this at the back of the instrument board. We abandoned this before the War.

One way of covering in around the instruments is with a complete wooden board as on the Springfield car, but we believe that it will be found very difficult to machine the mouldings into the board unless the board is jigged. It is not a job our coachbuilders could do.
  
  


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