An instrument to measure and compute the mean and standard deviation of the oscillations of a recording arm
B Hogley; B Hogley; Wool Industries Research Association, Leeds
Журнал:
Journal of Scientific Instruments
Дата:
1952-03-01
Аннотация:
An instrument is described which measures the displacement y of the arm of a pen recorder at regular intervals along the recording chart, whilst the chart is being produced. The instrument computes Σy, and Σy<sup>2</sup>. Its computing section does not contain a squaring device, but produces the square of a given measurement by means of an interconnected system of Post Office relays. The quantities Σy, Σy<sup>2</sup>, and n the number of measurements made, are displayed on Post Office type message registers. The quantities recorded facilitate the calculation of the mean and standard deviation of the pen arm displacement.
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