Of Winds and Sounds.

Cavities of the Ear, where the Audits

Nerve receives the Impression, and e5C

cites

24. The Doctor measured the upper Surface ofPair of Smith’s Bellows, and also the Space they ^scended through in a Second of Time ; by whicfound the Quantity of Air expell’d in that Time j495 cubic Inches in its comprefs’d State. Now to ^what Degree of Compression it fuffer’d, he fix’d acurial Gage to the Nose of the Bellows, and

Force of the comprefs’d Air sufficient to raise thecury one Inch high, at a Mean. Hence it appears ^the Force with which the Bellows impell’d Air in £0Fire was - 3 * s of the Weight of the Atmosphere. . f0 ’

25. Hence also it follows, that the Air driven ^the Nose of the Bellows in one Second was mof e ^495 Inches by Part of that Quantity, viz c jjcSInches, which added to the former make 511

of common Air. To find the V elocity withAir was impelled, he measured the Area of theof the Nose, and by that divided the 49 z Inches,'" f 0 (gave for the Quotient 825 Inches, or 68,74 ff.s S c 'the Length of the Cylinder of Air which rufh’d r^ Q ^cond thro’ the Nose of the Bellows ; which pt° fAVelocity of Air acting constantly on the elastic r ?'Particles of Fire must immensely increase their $Motion, and proportionably augment the Heat, s o*consists therein, and from which all bur Senf a£1

this Kind are derived.

26. The Doctor concludes with a Query,

If the Force with which the Air is impell’d by £lows into the Organ Pipes were taken in this iwe might not estimate the Velocities of the Hn^u -of Air required to form the various Notes ° £ . ter b c 'The Velocity of undulating Air to that of ^ g£:

:tht s

t 0

ing as their Densities inversely, nearly, viz- aS '

I, as will be strewn farther on. ci^'

27. Mr. Martin Triewald of Sweden has labited a new Invention for producing a continuaof Air, to blow the Fire of great Forges, F 10 pgi''

is'c. and which may properly be call’d WAT Jt0 vi' s ' >