Bauhaus-Universität Weimar

Experimental Psychology: A Manual of Laboratory Practice, Vol. II: Quantitative Experiments, part 1: Student's Manual
Titchener, Edward B.
18 Preliminary Experiments 
axes, A and A', and are coupled by a clock-spring. The lower 
lever, L, carries at its extremity a point of horn or bone. This 
is the stimulus point : it rests upon a small disc of cork or card¬ 
board, which in turn rests upon the skin. Attached to the upper 
axle, A', is a paper scale, reading in degrees from o° to 50°. 
The horizontal arm is clamped in a standard ; the clamp serves 
for the coarse adjustment of the instrument, while the fine ad¬ 
justment is effected by the nut N. The intensity of stimulation 
is regulated by the set-screw 6" and read off (in degrees) from 
the paper scale. Six clock-springs of different tension, and discs 
of three sizes (0.75, 1, 1.5 mm. diam.), are supplied with the 
As thus described, the apparatus permits us to vary the place, 
the intensity and the area of the stimulus. The RL depends, 
further, upon its rate of application. To control this factor, we 
have recourse to the following device (Fig. 9, a, b). 
A thread attached to the end of the lever L' is led upwards, 
over a small and easily running pulley of hard wood, P, to the 
inner end of the metal strip M. The strip is supported hori-


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