" " 5 24 " " 15 deg. " 36 " 10 deg.
" " 6 24 " " 15 deg. " 40 " 9 deg.
" " 7 24 " " 15 deg. " 45 " 8 deg.
" " 8 24 " " 15 deg. " 30, 36, & 48 holes

Circle 1 produces a single note, circle 2 a second, circle 3 a third,
circle 4 a fourth, 5 a fifth, 6 a sixth, 7 a seventh, and 8 a perfect
chord.


II.

_Experiments to prove that the shocks may proceed from two or several
different places to conspire in the formation of a note, provided that
the isochronism of the shocks is sufficiently exact, and that the shocks
are produced in the same direction_.

Disk No. 4 has--

On circle 1 24 holes.
" " 2 36 "
" " 3 23 "
" " 4 12 at an angular distance of 10 deg. from the holes
of circle 3.
" " 5 12 holes at an ang. dist. of 20 deg. from those of circle 3
" " 6 12 " " " 0 deg. "
" " 7 12 " " " 15 deg. "
" " 8 12 " " " 15 deg. "

1. If from the same side two currents of air at an angular distance of