[ ] 
Sthly , I proceeded, as before, with Steam in the 
Globe A ; and condenfed it, as in the third Experi- 
ment ; and then tried the Preifure of the Atmofphere 
on the Clack or Valve D, and found it required about 
io ife Troy , to lift the Clack from its Tube of i Inch 
Diameter ; but in this I was not exaft with fmali 
Weights. 
6thly, I excluded the Air with the Steam, and in 
Place of the Clack I fcrewed on very tight a Plate, on 
which I placed a glafs Receiver, as ufual, with the 
Air-pump ; and then, turning the Cock, the Air under 
the glafs Receiver expanded itfelf into the Globe, by 
which I had equally a Share of the Vacuum partly 
made in the Globe, and could thereby make many 
Experiments that are made with the Air-pump, &c. 
which I mention only, that fome curious Gentlemen 
may hereafter make fome further Obfervations by the 
like Experiments. 
Obfervations from Experiments made by J. Payne. 
i. r J ' H AT a Pot or Veifel, of the Size and Shape 
-*■ here mentioned, will (being kept to a dark- 
red Heat, and the Water regularly difperfed) rarefy 
or expand 50 Gallons of Water, Wine Meafure, per 
Hour. 
2 . That a cube Inch of Water will make in Pra&ice 
4000 Inches of Steam ; or that the elaftic Steam of 
one cube Inch of Water is fufficient to exclude the 
Air out of a Veifel that is in Content 4000 Inches. 
3. That the. above 50 Gallons will produce 
46,000,000 cube Inches of elaftic Steam per Hour, 
which is per Minute 770,000. 
4 . That 
