( 517 ) 
Metal damper at d. (Fig. 1.) 
Mute effect, strongest on the g side, g string strongly damped. 
d string less, bad in tone. 
a string still less, bad. 
Metal damper at e. 
Damping, diminishing towards 
the g side. The g string has 
retained its original tone better 
than the e string in the d posi¬ 
tion of the damper. 
e damped, but much less than 
the g in the d position of the 
damper. 
a less damped. 
d damped, gives the mute-sound 
more than the a string, but is 
still comparatively strong in 
g less damped than d, very ugly. 
Both observers thus found, that in the position d the damping 
effect diminished towards e and vice versa. 
Thus e. g. in the e position of the damper the g string was but 
little damped, although in this case assuming the bridge to vibrate 
chiefly in its own plane, the g string would act on a 
bridge with much increased moment of inertia which 
would involve strong damping. 
We think therefore that we may infer from these 
experiments that the motion of the bridge does not prin¬ 
cipally take place in its own plane about one of its feet, 
but that it vibrates chiefly transversely, as shown dia- 
grammatically in Fig. 3 where ab represents the bridge 
in section. On this assumption the results of all the above 
experiments are completely explained : 
I. A damper placed at a has much less damping 
influence than a damper at c, as the moment of inertia about gh is 
much less increased in the former case. 
II. The effect is about the same whether the damper is attached 
at a or at b. It is clear that the moment of inertia of the bridge, 
with the clamp attached, about gh has about the same value in 
the two cases. 
III. Again the results of the second set of experiments become 
LI 
Fig. 3. 
