Choosing employees by mental and physical tests . 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 su
Choosing employees by mental and physical tests . 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. The Chronograph The picture herewith is a chronograph used by Mr. can record many mental and physical operations with theexact time thereof. It consists of a cylinder around whichis wound the paper for a record, clock mechanism to revolvethe cylinder at a certain rate, a writing point to make rec-ords on the paper, magnets to bring the point in contact withthe paper, and telegraph keys for giving signals and oper-ating the writing point. Mr. Edison has found the relativemental alertness of a number of his staff by this means. Thesubject tested is placed in another room, where he operatesa telegraph key. The examiner presses a key which causes aclick of the subjects receiver and at the same time marks thepaper on the cylinder. The subject on hearing the signalpresses his key, which makes another mark on the the cylinder has revolved in the meantime at a specificrate, the distance between the two marks shows the speed ofthe subjects mind in acting and enables us to
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