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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).
Evaluating American-made pressure gauges for use on American chassis, comparing them to existing Salter gauges.

Identifier  WestWitteringFiles\D\January1920\  Scan21
Date  27th January 1920
  
To R.{Sir Henry Royce} from Hs.{Lord Ernest Hives - Chair}
c.c. to C.
c.c. to BN.{W.O. Bentley / Mr Barrington}
c.c. to OY.
c.c. to Na.{Mr Nadin}
c.c. to Wor.{Arthur Wormald - General Works Manager}

ORIGINAL

2

Hs{Lord Ernest Hives - Chair}4/LG27.1.20.

X.3493. RE. PRESSURE GAUGES FOR AMERICAN CHASSIS.

We have received an oil pressure and an air pressure gauge from America which it is proposed to fit to the American chassis. The gauges are made by the U.S. Gauge Company. We have tried them on a car and find them quite satisfactory. We have taken one apart and find that the mechanism and workmanship is quite as good, in fact better, than the Salter gauges which we are at present fitting. The scale range on the instruments is rather narrow; on both instruments the scale only extends over 60°. We think that for the oil pressure gauge it is better to have the wider scale like we have on our gauges because sometimes when the car gets old and the bearings are worn, the oil pressure may have to be run at 10 lbs. or just under. On the narrower scale the movement of the needle is comparatively small. The dials of the gauges should also be plainly marked "FUEL" for the pressure gauge and "OIL" for the oil pressure gauge. This is a point which Mr. Royce, in the past, insisted on having.

A point which should be considered is that fact that these gauges will not be interchangeable with the present English gauges we are using because of their outside diameter and because of the thread for the union nut being different.

We think it is worth while aiming at interchangeability even with such fittings as these, otherwise, we shall have to keep a stock
Contd.
  
  


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