Rolls-Royce Archives
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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).
Calibration results for a Light Weight Ben-Sports instrument at various temperatures.

Identifier  ExFiles\Box 59\2\  Scan274
Date  7th November 1933
  
B.J.I.34
MEMORANDUM.
A.T. SPEEDOMETER CO LTD.,
BRITISH JAEGER INSTRUMENTS. LTD.
To Mr. Buckland.
From Mr. Arrowsmith.
86051
Date 7/11/33

Light Weight Ben-Sports Instrument.

Scale reading m.p.h.
r.p.m. of drive.
Temperature.
Calibration.

62
800
65° C 149 F
2 miles Slow

64
800
20° C 68 F
Correct

64
800
Minus 5° C 23 F
"

Material used for the Magnetic shunt is Monel Metal.

"795 RPM is official - at 63mph
new 2.15 ozs
old 3.14 ozs
  
  


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