The Complete Works in Philosophy, Politics and Morals of the late Dr. Benjamin Franklin, Vol. 2 [of 3]

By Benjamin Franklin

Page 239

three knobs h h h
against the inside of the vase, and slipping the drawer into its
place; the machine is fit for use.

_To use it._

Let the first fire be made after eight in the evening or before
eight in the morning, for at those times and between those hours all
night, there is usually a draft up a chimney, though it has long been
without fire; but between those hours in the day there is often, in
a cold chimney, a draft downwards, when, if you attempt to kindle a
fire, the smoke will come into the room.

But to be certain of your proper time, hold a flame over the air-hole
at the top. If the flame is drawn strongly down for a continuance,
without whiffling, you may begin to kindle a fire.

First put in a few charcoals on the grate H.

Lay some small sticks on the charcoals,

Lay some pieces of paper on the sticks,

Kindle the paper with a candle,

Then shut down the top, and the air will pass down through the
air-hole, blow the flame of the paper down through the sticks, kindle
them, and their flame passing lower kindles the charcoal.

When the charcoal is well kindled, lay on it the sea-coals, observing
not to choak the fire by putting on too much at first.

The flame descending through the hole in the bottom of the vase,
and that in plate D into the box C, passes down farther through the
grate W W in plate B 1, then passes horizontally towards the back of
the chimney; there dividing, and turning to the right and left, one
part of it passes round the far end of the partition 2, then coming
forward it turns round the near end of partition 1, then moving
backward it arrives at the opening into the bottom of one of the
upright corner funnels behind the niche, through which it ascends
into the chimney, thus heating that half of the box and that side of
the niche. The other part of the divided flame passes round the far
end of partition 3, round the near end of partition 4, and so into
and up the other corner funnel, thus heating the other half of the
box, and the other side of the niche. The vase itself, and the box C
will also be very hot, and the air surrounding them being heated, and
rising, as it cannot get into the chimney, it spreads in the room,
colder air succeeding is warmed in its turn, rises and spreads, till
by the continual circulation

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