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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).
Page detailing deduction percentages for various volt and ampere range readings, with a note on instrument care.

Identifier  ExFiles\Box 33\4\  Scan186
Date  21th February 1920 guessed
  
-3-

36. 150 volt range.

Reading Deduct.
0 - 50 Correct.
50 - 150 .7%

37. 1.5 ampere range.

Reading. Deduct.
0 - .5 Correct.
.5 - 1.5 .7%

38. 15 ampere range.

Reading. Deduct.
0 - 3.5 Correct.
3.5 - 12.5 .5%
12.5 - 15.0 .8%


EFC.

Please in future take special care of instruments so as to reduce necessity of too frequent calibration.

EFC.
  
  


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