Bauhaus-Universität Weimar

Some new apparatus. 
Pistol hey. 
This serves for investigating the reaction-time in starting to run. 
The blast from the pistol barrel a, fig. 21, moves the fan /so that 
contact is broken at d for an in¬ 
stant, the lever being drawn back 
by a spring. Only a few experi¬ 
ments have been made with the 
apparatus. These, however, have 
brought to notice the following 
facts : 1. the reaction-time is 
about one-third shorter for short- 
distance runners, who are trained Fig. 31. 
to start quickly, than for long-distance runners ; 2. the reaction¬ 
time for movements of the whole body is longer than for move¬ 
ments of a single member. 
Voice hey. 
The voice key, fig. 22, is in¬ 
tended for experiments on the 
time of associating ideas. It 
comprises a cylinder of hard 
rubber holding a metal plate at 
the end furthest from the mouth. 
A fine screw rests lightly against 
this plate. The current is sent 
through the point of contact 
between screw and plate ; it is 
interrupted by the vibration of 
the plate in response to the voice. 
With the spark method this pro¬ 
duces a chain of dots on the drum 
while the word is being spoken. 
Fig. 22, 
With two voice-keys and a telephone connection the person 
experimented upon can be in a distant room, a key being placed over 
the opening in each transmitter. 
Touch hey. 
A long flexible spring, fig. 23, is mounted in a wooden handle and 
bears against a short rigid arm, also attached to the handle, so as to 
keep closed än electrical circuit. The circuit is led into the handle


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