Concords of the Octave, Art. 90.

Fig. 14. Ordinates representing sin v+sin zv, from v=o to v=360°.

g. 15. Ordinates representing sin v+sin (zv+90°), from v=90° to v=450°.

Fig. 13. Art. 83. Stopped organ-pipe, with mouth-piece, and adjustable plug.

Concords of the Fourth, Art. 90.

Fig. 16. Ordinates representing sin 4v+sin 3v, from vo to v=360°.

Аа

A

Ordinates representing sin 4v+sin (3v+22°. 30′) from -20o. 30′ to 562o. 30'.

Fig. 18, Art. 92. Beats of imperfect unison. Ordinates of ten waves.

ма

Ordinates of eleven waves transmitted in the same time.

Sums of the corresponding ordinates.

Fig. 21,
Art. 103.

Fig. 19, Art. 103.
Elastic lamina on
frame.

Fig. 20, Art. 103. Laminæ opened by current of air.

VOAEL

Enlarged section of mouth-piece.

Fig. 6, Art. 18. Undulations of particles of air, transmitting waves of sound.

Fig 7, Art. 18. Undulations of particles of ether, transmitting waves of light.

Particles quiescent, y a d' g° F.

·

(a)

d

Particles in undulation.

α

(a)

(8)

Fig. 8, Art. 18. Undulations of surface-particles of water, transmitting ordinary waves.

(2)

(8)

(e)

(5)