f r 4 V(S ) 
l took a ftrong Glafs Receiver, open and arm’d with 
Brafs Hoops at top and Bottom : To which parts were 
apply’d two Brafs Plates with wet Leathers between them, 
but fir ft were included two Brafs Hemifpheres which 
j/jyn d on a wet Leather, their Diameter was 3 Inches and 
half, A Mercurial Gage was iikewife included. To the 
upper Hemisphere was ferew'd a large Brafs Wire, which 
part tfaro’ a Box of Leathers that was ferew’d on the 
Upper Plate, and could eafily be mov’d up and down 
without buffering any Air to pafs with it. To the upper 
part of this Slip- Wire was ferew’d a Cock, thro’ which 
the Air was to be Inje&ed. In this manner the lower and 
upper Plate were ferew’d ftrongly to the Receiver* into 
which, after an Atmofphere of Air had been thrown, 
("which was eafily difcoverable by the Gage, the Air in 
which pofieffing but half the fpace it did before,) the 
Syring was taken off, and an Iron with an Eye was 
ferew’d on in its Place, by which the whole Apparatus 
was fufpended on a Triangle. To this Iron related the 
Slip- Wire and Upper Hemifpheres All the reft being part 
of the weight made ufe of to. feparate them. Then into 
the Scale, which hung at its bottom, was put in fo much 
Weight as, with its Aggregate, amounted to full 140 
Pound, before the Hemifpheres could be parted : The 
Fri&ion of the Slip-Wire thro’ the Box of Leathers was 
very inconfiderable. Now bow thofe Gentlemen, who 
account for the Ottogerick Experiment by Suftion, or the 
Funicular Power, how, I fay, will their Hypothefis An- 
1 ’wer for this, which is only the Reverfe of it, (there be- 
ing no room left to apply either, the Air within the, 
Hemifpheres remaining in its natural State) I cannot tell 5 
but think they muft abandon their Reafon to deny the 
Doffrine of the Airs Preffure, after fo convincing an Ex* 
penmen t as this, which not only moft ftrongly confirms 
and eftablilhes the fame, but leaves no manner of Umbrage 
for any other Hypothefis to take place in it. 
POST- 
