[ 1 
Pot, when it is immediately rarefied or expanded into 
an elaftic Steam or Vapour, fit for Application to give 
Motion to fundry forts of Machinery, &c. 
Tab. VI. Fig. i. 
it ft, A, A Globe made of Copper, 12 Inches 'Dia- 
meter, 
B, B, Two brafs Cocks, one oppofite to the other , 
fitted very tight. 
C, A Handle or Bale, f aft ened to the Globe , 
by which it may be hung or held up. 
D, A fmall Valve or Clack, fitted to the 
upper Cock, of One Inch Diameter. 
The Whole, thus fitted, weighed 15 Pounds 3 Ounces 
Troy, or 12 Pounds 9 Ounces \ Avoirdupois ; and, 
filled with Water, it weighed 45 Pounds 7 Ounces, 
from which dedud the Metal, the Weight of Water 
is 32 Pounds 13 Ounces ~ Avoirdupois , which is 
about 4 Gallons, containing about 925 cubical 
Inches. 
This Vefiel or Globe I then hung over the large 
Vefiel F, in which Water was rarefied or converted 
into Steam 3 and by the Pipe E, at the large Cock G, 
which being open, as alfo the other Cocks BB, the 
Steam had a free Paffage through the Globe A, by 
which the Steam excluded or forced out the Air that 
was in the Globe, and by its elaftic Quality fupplied 
its Place ; when both Cocks B B were fuddenly fhut, 
and the Globe A taken down and hung over a Vefiel 
of cold Water, with the lower Cock B, immerged 
in Water, and then opened under Water 5 on which 
the Water rufhed into the Globe very furioufly, until 
