. The journal of mental pathology . ock work; and the inter-ruptions every second are obtained by means of breaks in an elec-tric circuit every second: the clock work causes the motion of anotched wheel and a lever falls from one notch on the other suc-cessively—every second—while the wheel is in motion; the timeof contact of lever with each notch and of fall on each notch isequal—one second. An electric current of ordinary bichromatecells is made to pass so that the circuit is closed at each contact ofthe lever with a notch on the wheel; the circuit is open—duringthe fall of the lever from on
. The journal of mental pathology . ock work; and the inter-ruptions every second are obtained by means of breaks in an elec-tric circuit every second: the clock work causes the motion of anotched wheel and a lever falls from one notch on the other suc-cessively—every second—while the wheel is in motion; the timeof contact of lever with each notch and of fall on each notch isequal—one second. An electric current of ordinary bichromatecells is made to pass so that the circuit is closed at each contact ofthe lever with a notch on the wheel; the circuit is open—duringthe fall of the lever from one notch upon the one following; thesesuccessive closures and openings of the circuit are registered bylines—known as ladder scale traces; the lines are traced by aDeprez signal in the same circuit with the wheel, as you may seein the arrangement of the instruments before you. * Presented at the July meeting, 1908, at the Societe Clinique de Mede-cine Mentale, Paris. THE JOURNAL OF MENTAL PATHOLOGY. Vol. VIII, No. 4,
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