to

Of Winds and Sounds.'

bration of the sounding Body, andthey all move with equal and uniformlocities, ’tis plain they must succeedother at Intervals proportioned to the 'f 1 ^of the Vibrations : but the Times of 1Vibrations of the fame Body are all e d l ’ a . 5consequently, the Intervals of thewill be so too (CV), ^

(CV) i. Sir Isaac Newton and other Math eclans have shewn (in a Method too prolix and i flt ^to be here repeated) that if a Pehdulum were coo^^e'whose Length was equal to the Height of an h 0 ® Asneal Atmosphere, whose Density is everyfame with that of the Air upon the Surface of th e 0 ii ein the fame Time that such a Pendulum wa ^^ S ’whole Oscillation in going forwards and hack c cthe Wave or Pulse of Air will pass through 3equal to the Circumference of a Circle describ e

L Radius equal to the said Pendulum

0 ('

2. Therefore while the Pendulum makes hal^dilation, or one single Vibration, the Pulse W>through a Space equal so half the Circu® ^ yjrfl?Whepce the Space described by the Pulse in thof a Vibration is to the Length of the Pendulu cll iiVSemi-circumference to the Radius, or as the (0 1 1ference to the Diameter, that is, as 3 ,i 4 i -59 fed’Now the Length of such a Pendulum is 3 oI ^ a |ceS ^(as we have elsewhere strewn) but Sir lfr aC . Tf29725 Feet, whose Measure we shall here foU° ^ J*Circumference of a Circle whose Radius is *1 pid*186768, the half whereof is 93384 a

pastes through in one single Vibration: But s®^ , 311 1

dulum 39,2 oscillates in'the Time of one 8cc ^ >>■the Times of Oscillation in different Pendum' ^ (jit-the Subduplicate Ratio of their Lengths; there fas.

m 2 9 7_25_Feet we hav e 356700 Inches, we^ 39=2 : V/356700 :: i : 95 | Seconds.

i"