Abstract
This chapter discusses the measurement of nonelectrical quantities. The measurement of the degree of acidity or alkalinity of a solution is a matter of some importance to a wide variety of industries. In general, the effective acidity or alkalinity of a solution is not directly dependent upon the total quantity of acid or base present, although sometimes this relation may be important, in which case it can be measured by chemical titration. The effective acidity or alkalinity of a solution does, however, bear a direct relationship to the concentration of hydrogen ions in the solution. Computers are rapidly coming into use for use in measurements, either for the control of electronic measuring apparatus or for analysis of the data obtained in the measurements themselves. An investigation of the exact nature of high-speed movements is often important, and for this purpose, investigation under the illumination from a flashing source of light—so controlled that the repetition rate is very nearly equal to the speed of rotation or the rate at which some particular part of the operation repeats—enables a high-speed phenomenon to be examined as though it were moving quite slowly.
Published Version
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