Choosing employees by mental and physical tests . bject to copy a composition withabsolute fidelity to every detail. Mathematical ac-curacy has already been treated and is rated under thathead. A means of rating eye and touch accuracy willbe treated under Estimating Numbers, page 286. Mental. Speed The fields of mental application in business are sovarious that practically every branch will have to haveits specially applied test. Where mental speed is combined with hand actionand quick sense perception, the eye-and-hand and ear-and-hand co-ordination tests, already given, are psycho
Choosing employees by mental and physical tests . bject to copy a composition withabsolute fidelity to every detail. Mathematical ac-curacy has already been treated and is rated under thathead. A means of rating eye and touch accuracy willbe treated under Estimating Numbers, page 286. Mental. Speed The fields of mental application in business are sovarious that practically every branch will have to haveits specially applied test. Where mental speed is combined with hand actionand quick sense perception, the eye-and-hand and ear-and-hand co-ordination tests, already given, are psychological laboratory test, which consists ingiving an eye or an ear signal to stop a delicately ad-justed chronoscope, is the most accurate. Theoretic-ally, these tests should be useful in rating the quickresponse of engineers, motormen, chauffeurs, pilots, CONCENTRATION 271 etc., to signals or danger; but as yet they are largelyon a theoretical basis from the difficulty of applyingthe law of extremes or trying out the best against thepoorest The Hipp Chkonoscope Courtesy of C. H. Stoelting & Co., Chicago The chronoscope is used in the same method as the chrono-graph for recording within one-thousandth part of a secondthe exact time of mental and physical reactions. Instead ofthe record being recorded on a cylinder it can be read directlyfrom the fractional second dials shown. Eye or ear signalsare made by the examiner, which start the clock-dial mechan-ism and the subject presses a telegraph key in response, whichstops the second hands. The dials will record the exact timeof the subjects action. The chronoscope and chronograph aretheoretically useful in all jobs requiring quick mental action,such as train dispatchers, engineers, and machine operators,where quick stoppage is essential to save waste of valuablematerial. 272 CHOOSING EMPLOYEES
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