[ 3IS ] 
Rear the handle, with a hole in their middle, to fix 
them on an upright iron pin fattened on the bellows 5 
that by this means the weights may the more com- 
modioufly be put on or taken off. For, according 
to the different depths of the liquor in the flill, fo 
will the force of the included air, againfl the upper 
board of the bellows, be more or lefs. Thus, fup- 
pofing the depth of the water in the flill to be twelve 
inches, from the furface of the depreffed water in 
the air-box, then the preffure of the included air 
againfl the upper part of the bellows, will be equal 
to that of a body of water a foot deep, and as broad 
as the inner furface of that board. It will, therefore, 
be requifite to add or take off weights, according to 
the different depths of the water in the flill, at dif- 
ferent periods of the fame diflillation. The bellows 
mufl be proportionable to the fize of the flill, but 
need not be very large. Where-ever the hills are 
fixed in flaips, the air may be conveyed to them from 
the bellows^ either through a fmall leathern pipe, 
diftended with fpiral codes of wire, or through Bam- 
boo canes, or broad fmall wooden pipes, like hol- 
low hfhing rods. 
4. When I firfl dUlilled in this ventilating way, 
in order to eflimate, what the difference might be 
in the quantity diflilled, by that or the common me- 
thod, I tried both wajs, by receiving the diflilled 
liquor into a quarter of a pint glafs, eflimating the 
times by a pendulum beating feconds. Where I 
found, to my furprize, that fometimes three times 
more was diflilled by ventilation than by the ufual 
way : But finding inequalities in the fmall quantities 
thus diflilled, in order the more fully and affuredly 
S f 2 to 
