240

Of Winds dnd Bounds.

ll

'The Locus or audible Place of Sound, ^be there where the Particles of Air hrll

g 1 *

jfpril 24, 1705, a S. W. by W. Wind in the gjDegree permitted the Sound to arrive in 116 Hab'conds; the fame Wind on Feb. 4, 1706, biowingff jf,4 Degrees of Strength, brought the Sound in 113Seconds ; and on April 5, 1705, the fame Wind if.7 Degrees of Strength brought the Sound in lit ^ o) )Seconds. The Winds which blow transversely C^Jo^April p,, Feb. 15,. 1705.) seem not to affect the j s>city of Sound, it passing then in 116 Half-Se^?which is mean Velocity, as appears by the former 1in Article 10.

15. The greatest Difference we here observe ifi 0 {Velocity of Sound, with or against the Wind, I s Lj?II Half-Seccnds, or 5 1 Seconds; whence 1142 X 5 ’'^6201 Feet, which is somewhat more than a M 15280 Feet; and therefore for every 10 Milesallow Half a Mile, or 2640 Feet, when theblows strongly against the Sound, and deduct fwhen it sets with it; and so in Proportion s ^ il>

other Distance.- See a late Discourse on this Suhr^7a Treatise entitled, Observations Ajlronomiques ^stques , jar Don George suan et Don Antoine Dt U, $16. The Velocity of Sound being determine ’ $jIntervals of the Pulses are known by findingVibrations the sounding Body performs in one d g jvThus D. Sauveur found by Experiments, that

Pipe, whose Length was about 5 Paris Feet,

fame Tone with a Str

String that vibrates forwctd^in a Second ; consequents’ us

backwards 100-times in a Second ; consequently’Pulses made by sounding such a Pipe, there at? fiop in the Space of 1142 Feet, or 1070 of f cC i

therefore a single Pulse occupies the Space of if °^ 1 > 0English, or 10 s Feet of Paris ; so that the fflf'the Pulse was about twice the Length of * pvtf eSWhence it is probable, that the Lengths of w 1 ®excited by the founding of open Pipes are in a 1 . _

equal to twice the Length of the Pipes, ^