426 A. M. Mayer on a method of measuring the 
meter. Therefore, if the resonator tube be lengthened 4 meter 
the serrations of its flame will no longer coincide with those of 
the pipe, but will bisect the spaces between the latter; for an 
impulse from the resonator has now to traverse such an increased 
length that it arrives at its manometric flame ;1,; of a second 
later than before the tube was lengthened. If the tube be 
lengthened one meter, or a whole wave-length (German), the 
displacement of the resonator serrations will amount to the 
entire distance separating the centers of two contiguous serra- 
tions; and on elongating the tube n number of wave-lengths, 
n number of such displacements will occur. Thus can be mea 
sured, not only one, but many wave-lengths, for I have not seen 
sensibly diminished the intensity of the pulses after they have 
traversed many meters of firm thick tubing. Therefore the 
error made in the determination of the distance occupied by 
many wave-lengths will not be greater than that occurrmg 
the measure of the length of only one; and, consequently, this 
error being divided over so great a number will proportionally 
increase the accuracy of the deduced length of a single wave. 
and form, closed by a large membrance which vibrates 
oe with the fundamental note of the pipe, and proceed as 
above. 
gas, by the process I have described, greatly exceed in 8 
curacy the results heretofore obtained by Dulong, Wertheim 
and others who deduced the length of the wave and velocity 
from measures of the internodal distances in organ pIpes; 
which embodies the principle invented by Herschel, and which 
has its highest development in the exquisite interference @pP® 
_ratus which Kénig has recently described in Poggendorff’s Ann® 
ten, Bd. exlvi, p. 165.* , 
In my lecture-room I have hung up before the students * 
series of gum tubes having lengths of }, 1, 11, 2, 24, 3, ete. WaV® 
* See the translation of Konig’s paper in this No. of the Journal. 
