Popular science monthly . Psxchol-ogists ha\-e known and emjiKniHl whatis called the dArsonval chronometer formany years. Hut it is unlikeK that the(Ulicate mechanism has ever been putto such an inliTesting task. One part of it tests the determines the tremor of thenerves. Still another registers the respi-ration. AnothiT ajjparatus discovers theability, or the , of the .ipplicantlo wilhslaiid fatigue. .After he has ..HO Popular Science Monthly 581 undergone several simple cx;uninations,tlie candidale is seated in a cliair andthe fnial, supreme test is ajiplied. Ho
Popular science monthly . Psxchol-ogists ha\-e known and emjiKniHl whatis called the dArsonval chronometer formany years. Hut it is unlikeK that the(Ulicate mechanism has ever been putto such an inliTesting task. One part of it tests the determines the tremor of thenerves. Still another registers the respi-ration. AnothiT ajjparatus discovers theability, or the , of the .ipplicantlo wilhslaiid fatigue. .After he has ..HO Popular Science Monthly 581 undergone several simple cx;uninations,tlie candidale is seated in a cliair andthe fnial, supreme test is ajiplied. How would most men act if a revolverwere discharged unexpected!) behindtheir ears? The answer is simiiie. The\would leap into the air; their heart-beatwould probably double; the\ wouldgasp and tremble as if they had so doing they would promptlydisqualify themselves as aviators in theFrench army. In testing the possibilities of an avia-tor, various contrivances are attached tothe body, all having a definite Tubes lead from these devices to aslowly rotating cylinder, on which i)aperis wrappeil. They terminate in pointswhich record the slightest variations inhis [)h>sir|ue. When the clockwork has started andhe is perhaps wondering what the queerapparatus is all about, a deafening ex-plosion takes place a foot behind record made at that moment on therevolving paper determines whether ornot he is to become a French his heart-beat, his respiration and hisarm nerv^es and muscles show no undueexcitement on the paper cylinder, hegoes to work. But if the stylus actuatedby his pulse-beat dances about therotating sheet, he is disqualified. It isonly natural that his reflex nervoussystem should respond in some way tothis sudden stimulus; but the man whotests him knows how wide a variationfrom normal may be tolerated. Next in importance to the revolver-shot test is that which ascertains thecandidates promptness in acting uponan external command. For
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1872
