120 
PHYSICS: C. BARUS 
Proc. N. a. S. 
= 0, 10, 20, 30, 40, 50 cm. gave intensity distributions, s, very definite 
and inter-related, but quite unsymmetrical to the pipe vertical. The 
5-oscillations in eastern and northern i?-disp]acements from the center, 
(i. e. to open locations) were meager, while the 5-oscillations for southern 
and western directions, trending toward closed parts of the room, were 
very marked. As r increased from 0 to 10, 20, 30, the maximum intensity 
lay toward the south; beyond this (r = 40, 50 cm.), it moved to the west. 
All the maxima of intensity were larger than the intensity on the table, 
under the pipe {r = 0) ; even at r = 50 cm. (meaning a pipe resonator 
distance of 64 cm.), the 5-value was a little in excess of 5 = 23 for the 
normal case. 
Another view of the results was given by collecting all the points on 
the line S-N along x, and on the line W-E along y. The features of the lat- 
ter were somewhat vague, but the S-N line presented conspicuous crests 
and troughs. These were from 40 to 45 cm. apart, and situated on either 
vSide of, but without other appreciable reference to the pipe vertical P in 
their contours. The inference would be that we must look to other causes 
for their occurrence. 
The mouth of the pipe was now raised in the same vertical to 2p = 50 cm. 
above the table, or a little over a wave-length (48 cm.). The data so ob- 
tained are constructed in the way described in figures 1, 2, for the rota- 
tion of the resonator and figure 6, for its corresponding =*= x and ^ y dis- 
placement. The central intensity (r = 0) has increased, because of the 
X-elevation conformably with the earlier results. The curves as a whole 
are simpler in outline; the unique maximum is again transferred from 5 
to W as r increases, this time a little sooner, in fact; i.e., before r reaches 
30 cm. For large values of r, intermediate azimuths would have been de- 
sirable ; but as the phenomena are adequately given by the linear surveys 
of figure 6, the extra labor was thought superfluous. The S-N lines in 
both surveys are very much alike, the maxima and minima in the case of 
figure 6 having been shifted into the north or positive x, for the elevated 
pipe. This also recalls certain earlier results. The distances apart of 
crests and troughs is here somewhat more difficult to define; but it is 
still much above 40 cm. and the pipe vertical is ignored as before. 
For the fixed position of the pipe, it was now desirable to raise the plane 
of the resonator and the graphs figures 3, 4, and 5 contain the nodal in- 
tensities for an elevation 2r = 12 cm. (a quarter wave-length) above the 
table. This is the level of an antinode at the pipe normal and the curves 
are therefore low throughout, as in the earlier work for normal positions. 
Nevertheless as we depart from the pipe normal or center, to circumfer- 
ences of radii 10, 20, 30 cm., the unique maxima in the south become 
prominent and beyond r = 30, they again shift to the west. 
In figure 7, the S-N line has the same characteristics as in figure 6 with 
