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).
Guide on understanding and recording zero errors and zero corrections for instrument readings.
| Identifier | ExFiles\Box 165\3\ img023 | |
| Date | 1st December 1920 | |
| Contd. -3- EFC3/T1.12.20. It will be assumed that figures given are the true corrected values unless otherwise stated. If, for any reason, corrections cannot be made before reporting the results, the fact that the figures are uncorrected should be definitely stated. In talking of zero errors and zero corrections, the following is to be understood:- The zero_error of an instrument is the amount in scale divisions by which the needle stands away from the zero mark on the scale when no current is passing through the instrument. If the needle is above the zero, the zero error is positive, if below, negative. It will be seen that the correction for the reading is of opposite sign to the error, thus a zero error of - 1.5 divisions implies a zero correction to the reading of + 1.5 divisions. When recording zeros, it should be made quite clear whether the figure with its sign as recorded is the zero error or the zero correction. EFC. 6084 G (60-8-11 '6VI H.{Arthur M. Hanbury - Head Complaints} S. (L.001) vss R R | ||