M. C. Thiseng— Velocity of Sound in Wood. 131 
from EK; B, as near the center as the clamp would allow. The 
resulting values _ in the following table are averages of 
fifteen observations 
AR Se ee ge ee ee ee ae Se ee ee ee ee 
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TABLE V. 
Showing the effect of the Damper. 
Rods. Damper at end. At D. At Cc. At B. 
ie 3798°9 M. 3777-1] M. 3787°9 M. 3786°4 M. 
2. 4063°7 4078°5 4062°7 4067-9 
thang 3883°1 3872-0 3869-1 3865-0 
nadia 4876°8 4895°7 4840°7 4866'T 
net 5226°9 5205-0 5208°2 5213°7 
pede bs Poem Cosh SPN, 4511-4 4517°6 4560-1 
fh, 4272°4 4244-4 4255°5 4259°3 
oust if 4259:1 4248-0 4256°0 4265°T 
The results given in tables 2, 8.and 4 were obtained without 
the use of the dam soe 8 
rth while to mention. that some of the rods 
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TABLE VI. 
Rods, | Damper at E, AtD, | At Cc. At B. 
No. 2, 3637°6 M. 3663°2 M. 3663°6 M. 3704-7 M. 
No. 3, 3643-87 3696°42 3677-12 3679° 
Subsequent investigation led me to the supposition of the 
coéxistence of transverse and longitudinal vibrations; the 
higher note being the normal note produced by longitudinal 
Vicars bx the lower note being due to transverse motion. 
order to test this matter, the glass plate was caused by 
the falling weight to move in the direction of the length of the 
rod, and it was foand in point of fact, possible in this manner 
to register its transverse vibration. The number of transverse 
vibrations obtained for the high note = oy nearly equal 
to the number of the longitudinal vibratio The same rela- 
tion existed between the transverse and jongitenia vibrations 
