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<p n="415">September 1784</p>
<p n="416">If the Room has no Fire Place and is too close to burn<lb></lb>
charcoal, it may be kept boiling while it is playing on the<lb></lb>
infected Places (if the Engine is made of Copper or Tin) by a large<lb></lb>
heated Iron placed under it</p>
<p n="417">It will be necessary while this is performing, that every door<lb></lb>
Window or Aperture that has not an immediate Communication<lb></lb>
with the external Air be close stopt, and as many Openings next<lb></lb>
the external Air be left open as can with conveniency be<lb></lb>
admitted, that as the rarified impure Air is forced out, as<lb></lb>
much of the pure fresh Air may supply its Places as possible<lb></lb>
The opening & shutting of the different Out and Inlets must<lb></lb>
be strictly attended to.</p>
<p n="418">By the above method, what Air is left impure after the<lb></lb>
Rarifaction of the boiling Vinegar, will be in a great measure<lb></lb>
corrected by the Showers of Vinegar falling through it. But<lb></lb>
as this method will render such Rooms as are at the Time<lb></lb>
inhabited too wet to warrant such a Procedure, the following<lb></lb>
might be substituted, particularly where no Fire or Fire place<lb></lb>
is allowed</p>
<p n="419">Let a wide shallow Tub (or what is more commodiously<lb></lb>
used, The Machine a Description of which is here annexed)<lb></lb>
that has its Bottom perforated full of small Holes, be placed on<lb></lb>
Supporters as near the Ceiling as is convenient to pour in cold<lb></lb>
Vinegar, and another on the Floor, somewhat wider, immediately<lb></lb>
under the first, to receive the Liquor as it falls; which will<lb></lb>
serve repeatedly in different parts of the Room, till it has<lb></lb>
past through most of the confined Air.</p>
<p n="420">Firing Gunpowder will tend much to purify infected<lb></lb>
Places, as the Explosion will force out a considerable Column<lb></lb>
of Air, and make room for the admission of fresh, provided<lb></lb>
there is a Communication with the external Air as above<lb></lb>
recited; and the Smoke will be the Acid of Sulphur.</p>
<p n="421">And as a considerable Portion of fixed Air is generated<lb></lb>
in the Bodies of Men, and thrown out by the Mouth as<lb></lb>
excrementitious; the passing of <rs type="placeName" id="LMSMGO55609_geo277">Lime Water</rs>
<interp inst="LMSMGO55609_geo277" type="placeName" value="Lime Water"></interp>
<interp inst="LMSMGO55609_geo277" type="type" value="undefined"></interp>
through it,<lb></lb>
occasionally, as the Vinegar is directed to be Done will tend</p>
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