( 1904 ) 
the White Conduit^ fituate on the Weft of Jflington^ with muc'^. 
the like fuccefs as the former. Upon ftiaking the Bell before an/ 
Air was intruded, it was but jutt audible at 30 yards diftance. 
Upon the Injeftion of one Atmofphere (begging leave as before to 
call it fo ) it becanne then as audible at 60 yards, as it was before 
at 30. A'fecond being intruded, the Bell upon fhaking might then 
be heard at 90 yards diftance. But after that, tho near 100 ftrokes 
oT the forces were repeated, yet could it hardly be heard 20 yards 
iarth r. Which I atftribute in a great meafure to the Reafbns be- 
fore given. The* Morning was very Mifty, which caus'd a great 
Dew upon the Grafs. Little or no Wind ftirring. And the lilence 
requifite in making fuch an Experiment cicely, at laft began to be 
interrupted by the founds :oi the five a Clock BcIIs, and other 
Noifes which joyn'd in Chorus with them from the City, contri- 
buting in fome meafure to the unfuccefsfulnefs of the latter part of 
the Experiment : Which ftill I hope to profecute iarther, nor de- 
fpairing of finding fuch a Gage as will (how the Ceriainty of the 
Qtiantities injeSted, without any danger or hazard in the Attempt. 
VIIL AnExferimefst madB M a Meeting of the Royal Society^ 
touching the Diminution of Souni in^ Air rarcfy^i. By MrYi. 
Hauksbee. 
A Bell being included under a Receiver, which being fhaken 
to make the Clapper ftrike, it was very obfervable that the 
hKcrpofition of the Glafs betwixt the Bell and the Ear, was a 
great obftruftion to its Sound, notwiihftanding it was audible at 
tome good diftance from it : But gradually withdrawing the Air, 
and making feveral Stops to fhake the Bell at different Degrees 
. of Rarefaftion, the Diminution of the Sound at every Scop was 
\ ery diftinguiftable. Till atlafl, when the Receiver was well 
exhaufted of Air, the remains of Sound was then fo little, that the 
beft Ears could but juft diftinguifh it : It appearing to them like a 
fmall fhrill Sound as at a great remotenefs. Upon fufFering the 
Air to reenter \^ which was not done all at once, but by turns ) 
'rwas eafie to perceive the increafe of Sound at the different times 
the Bell was made to ring : The Recipient being again repleat 
with Air, the Sound then feem'd fomething more clear and audi- 
ble than it did upon its firft inclufion. . . . , , 
LONDON, 
Primed for Sam, Sm /V/jand Benj. Walfordy Printers to the Royal Society, 
at the Prinses Arms mSt Pdnh Churc>i-yard, 1705. 
