Rockett, Frank H. Engineering Consultant, Charlottesville, Virginia.
Backer, Donald C. Formerly, Department of Astronomy, University of California, Berkeley, California.
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Measurement of the time dimension. In practice, horology is the search for a steady or repetitive action, and the design of an instrument to perform that action and to indicate (read out) a measure of the action. Until early in the twentieth century, horology dealt with mechanical instruments, with effort distributed between improving accuracy and decreasing size of timepieces. Increasingly, however, electronic instruments have provided means for meeting these objectives. See also: Atomic clock; Atomic time; Chronometer; Clock (mechanical); Dynamical time; Earth rotation and orbital motion; Escapement; Maser; Oscillator; Pendulum; Pulsar; Quartz clock; Satellite navigation systems; Sundial; Time; Watch
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