Bauhaus-Universität Weimar

Some new apparatus. 
99 
with the covered opening. He finds before him a rubber button 
like that on a telegraph key. He is to press this button as soon as 
be sees the shutter move. He does so, and apother mechanism 
releases a horizontal bar running behind the scale. The pointer 
swings between this bar and the scale and is consequently stopped 
when the bar snaps against the scale. The pointer starts to move 
Fig. 15. 
when the shutter starts to fall and consequently any time that 
elapses thereafter will be indicated by the distance through which 
the pointer travels before being caught. The connection of the 
pointer with the pendulum is so light that it continues its swing 
(fig. 15) and is finally caught on the other side. 
The scale in front is graduated by actual comparison with tuning- 
fork records made by the finest graphic methods. Special electrical 
contacts are arranged so that the units of the scale indicate always
        

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