Bauhaus-Universität Weimar

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.


Sehr geehrte Benutzer,

aufgrund der aktuellen Entwicklungen in der Webtechnologie, die im Goobi viewer verwendet wird, unterstützt die Software den von Ihnen verwendeten Browser nicht mehr.

Bitte benutzen Sie einen der folgenden Browser, um diese Seite korrekt darstellen zu können.

Vielen Dank für Ihr Verständnis.