Bauhaus-Universität Weimar

RESEARCHES IN PRACTICE AND HABIT, 
BY 
W. Smythe Johnson. 
I. Triangular movement. 
The subject was required to tap continuously at the corners of an equilat¬ 
eral triangle whose sides measured 2o0m. This triangle was formed by a 
special triangular contact key, Fig. i, with knobs 2o0m from each other. 
This key was originally constructed at Dr. Scripture’s suggestion for 
use in testing school-children by 
Gilbert, by whom, however, it was 
used merely for tapping and not as 
a habit-key.1 
The key was placed in circuit 
with a 4 ampère battery and the pri¬ 
mary coil of a spark coil, the con¬ 
denser being connected around the 
break. From the poles of the sec¬ 
ondary coil, one wire led to the 
base of the recording drum, the 
other to the base of a ioo v.d. 
electric fork bearing a flexible point 
on one of its prongs. Pressure on 
one of the key-knobs closed the 
primary circuit for an instant. When the circuit was broken a spark 
passed through the smoked paper on the surface of the drum making a dot 
on the time line drawn by the fork. Each spark thus indicated a tap on 
one of the three key-knobs. The time between the sparks could be read 
to the thousandth of a second.2 
The subjects included : K. (Kochi) and M. (Matsumoto), who were 
Japanese students of psychology ; P. (Powell), a student of English ; 
1 Gilbert, Researches on the mental and physical development of school-children, Stud. 
Yale Psych. Lab., 1894 II 40 (especially p. 40 and Fig. 5). 
2 The arrangement of the recording apparatus was identical with that of Exercise IX 
in Scripture, Elementary course in psychological measurements, Stud. Yale Psych. Lab., 
1896 IV 113 ; it is shown in Scripture, New Psychology, frontispiece, London 1897.
        

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