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Of Winds and Sounds.

Of the Speaking Trumpet «/ the be/Form. O/Otacoustic Instruments?Of ^Note,Tone, or Tune o/’SouND 5 *Of Congords apd Discords; thetionale of the Diatonic Scale °jMusic. Fhe Mathematical Theory °fMusical Chords, and op Harmon 1 * 3Proportions. Of the Sympathetic W””brations of Musical Strings, & n< *other Bodies.

N this Lecture I shall consider theture of Wind andSouND in generaland of the Vibrations of Mis Al

Strings and Sonorous Bodies , with regard t0the Science of MUSIC.

WI'ND is a Stream or Current of A^sAs the Air is a Fluid, its natural State 15that of Res, which it endeavours alwayskeep or retrieve by an universal Equilibriaof all its Parts. When, therefore, this ^tural Equilibrium of the Atmosphere h a sspens by any means to be destroyed in an/Part, there necessarily follows a Motion 0all the circumjacent Air towards that P ar i t ’to restore it; and this Motion of the Ah lSwhat we call Wind (XCVII).

(XCVII) I. I shall Here give the principalpena of the Wind, as they are deduced from jHalhy 's admirable History thereof in the Philofop 1 '

■ ‘ Trans*#** 5 '