Of Winds and Sounds.

•without Dijiurbance or Confusion ; as isdent from Concerts of Musical Instruinest ts ’where divers Sounds, of different Inter va f

Also

deles of Air, and they make up - or - Part of ^whole-Space 979 Feet pafs’d through in one Secofl

a Pulse, therefore to allow for this we must add -'T'*’

“ -

iog Feet to the former Sum; that is, 979 -p1088 Feet, for the Velocity of Sound per Second- ^

6. But since the Atmosphere consists not of P u f 5 , Asibut has an Admixture of V apours of a different B 0 {city and Tone; these Vapours will not partici?^;the Motion of pure Air, by which Sound is prop^S so 1in like manner as an elastic String, if struck,

move another very near it, unless it be underDegree of Tension, and of the fame Tone. * ji-fore the Quantity of Air producing Sound must " ^minifh’d in Proportion to the Quantity of Vapo^ 1 "’^ $given Space ; in which Sir Isaac supposes the A> rthe Vapour as 10 to 1. Whence the Air and s ‘ jltogether in a given Space is to the pure Aitto Jto. . W

7. But the Velocity of the Pulses will increase

Subduplicate Ratio of the diminifli’d Quantity °‘ -0,

ter, that is, in the Subduplicate Ratio of I 1

to

1 °>

fa 8 *

/!>»

or in the entire Ratio of 21 to 20, (as he has ^Princip. Prop. 48. Lib. II.) Therefore, if fgc^fAs 20 : 21 :: 1088 : 1142; whence the real y e \f cof Sound thus investigated from the Nature of e ^ eAir by our great Author, is at length found t0the Rate of 1142 Feetprr Second. rsfr&rf

8. The Truth and Accuracy of this noble pfKhave been sufficiently confirm’d by Experiments’ 0cularly,. those made by the late Rev. Dr. v-'i

which I shall give some Account by and by >first lay before the Reader a View. of the dist^^pjjiePpiates made of the Velocity of Sound by severalPhilosophers, as in the Table following,