Psychological monographs: general and applied . ded10 above the glass cover of the middle portion of the box andconnected with the batteries and the timing apparatus as is in-dicated in Fig. 2. The timing apparatus is, in turn, attached toa Zimmerman kymograph by screws E and E1 in a way shownvery well in Fig. The revolving disc upon which the arm Arests is in direct connection with the shaft of the kymograph,which turns it around the dial at any speed desired. The dial isgraduated so as to read seconds, half seconds, and quarter sec-onds, when the kymograph is adjusted at the rate of one
Psychological monographs: general and applied . ded10 above the glass cover of the middle portion of the box andconnected with the batteries and the timing apparatus as is in-dicated in Fig. 2. The timing apparatus is, in turn, attached toa Zimmerman kymograph by screws E and E1 in a way shownvery well in Fig. The revolving disc upon which the arm Arests is in direct connection with the shaft of the kymograph,which turns it around the dial at any speed desired. The dial isgraduated so as to read seconds, half seconds, and quarter sec-onds, when the kymograph is adjusted at the rate of one revolu-tion for every 15 seconds. Each of the numerals, therefore,represents the number of seconds necessary for the arm A tomove from the zero point to the respective numeral as it appearson the dial. The contact B may be moved along the dial andfirmly set at any point by the thumb screw. The arm A is not 1 Carr, H. A., and Freeman, A. S., Time Relationships of Association,Psychol. Rev., Vol. XXVI, p. 465. RATE OF LEARNING IN THE WHITE RAT 15. Timing ApparatusFig. 2 fastened to the shaft of the kymograph, but is carried along byfriction on the large revolving disc. If the circuit is closed andthe electro-magnet pulls the lever C into place, the arm A is heldin the position shown in the drawing. The strength of themagnet is great enough to overcome the friction on the revolvingdisc. By pressing the contact key the circuit of the electro-magnetis broken, and is closed on the electric buzzer. This presssurenot only gives the sound stimulus, but it also releases lever C,allowing arm A to be carried along with the revolving disc andto pass over contact B, which closes the circuit through the in-duction coil and the system of wires on the floor of the the contact key is released the current again flows throughthe electro-magnet, attracting lever C, which keeps the arm Afrom moving when it again reaches that point. Thus the ap-paratus automatically completes the process, and
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Keywords: ., bookcentury1800, bookdecade1, booksubjectpsychology, bookyear1895
