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

By Benjamin Franklin

Page 212

of two feet long, or half the common
length of cordwood, may be burnt conveniently; and for the smaller,
such wood may be sawed into thirds. Where coals are the fuel, the
grates will be proportioned to the openings. The same depth is nearly
necessary to all, the funnels being all made of a size proper to
admit a chimney-sweeper. If in large and elegant rooms custom or
fancy should require the appearance of a larger chimney, it may be
formed of expensive marginal decorations, in marble, &c. In time
perhaps, that which is fittest in the nature of things may come to be
thought handsomest. But at present, when men and women in different
countries show themselves dissatisfied with the forms God has given
to their heads, waists and feet, and pretend to shape them more
perfectly, it is hardly to be expected that they will be content
always with the best form of a chimney. And there are some, I know,
so bigotted to the fancy of a large noble opening, that rather than
change it, they would submit to have damaged furniture, sore eyes,
and skins almost smoked to bacon.

3. Another cause of smoky chimneys is, _too short a funnel_. This
happens necessarily in some cases, as where a chimney is required in
a low building; for, if the funnel be raised high above the roof, in
order to strengthen its draft, it is then in danger of being blown
down, and crushing the roof in its fall.

_Remedies_. Contract the opening of the chimney, so as to oblige all
the entering air to pass through or very near the fire; whereby it
will be more heated and rarefied, the funnel itself be more warmed,
and its contents have more of what may be called the force of levity,
so as to rise strongly and maintain a good draft at the opening.

Or you may in some cases, to advantage, build additional stories over
the low building, which will support a high funnel.

If the low building be used as a kitchen, and a contraction of the
opening therefore inconvenient, a large one being necessary, at
least when there are great dinners, for the free management of so
many cooking utensils; in such case, I would advise the building of
two more funnels joining to the first, and having three moderate
openings, one to each funnel, instead of one large one. When there is
occasion to use but one, the other two may be kept shut by sliding
plates, hereafter to be described;[53] and two or all of them may be
used together

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Text Comparison with Benjamin Franklin and the First Balloons

Page 0
The five letters which I have the honor to present were written to Sir Joseph Banks, President of the Royal Society of London, in 1783, when Franklin was Minister to the Court of France and, with the collateral documents, they give perhaps the most complete and accurate account of the beginning of aerial navigation, enlivened with the humor and speculation characteristic of the writer.
Page 1
It was afterwards filled with the inflammable Air that is produced by pouring Oil of Vitriol upon Filings of Iron, when it was found to have a tendency upwards so strong as to be capable of lifting a Weight of 39 Pounds, exclusive of its own Weight which was 25 lbs.
Page 2
Since writing the above, I am favour'd with your kind Letter of the 25th.
Page 3
It contains 50,000 cubic Feet, and is supposed to have Force of Levity equal to 1500 pounds weight.
Page 4
It has been even fancied that in time People will keep such Globes anchored in the Air, to which by Pullies they may draw up Game to be preserved in the Cool & Water to be frozen when Ice is wanted.
Page 5
Faujas de St.
Page 6
in passing thro' this Flame rose in the Balloon, swell'd out its sides, and fill'd it.
Page 7
Robert, two Brothers, very ingenious Men, who have made it in concert with Mr.
Page 8
These Machines must always be subject to be driven by the Winds.
Page 9
(POSTPONEMENT OF CHARLES' AND ROBERT'S ASCENSION.
Page 10
I hope they descended by Day-light, so as to see & avoid falling among Trees or on Houses, and that the Experiment was completed without any mischievous Accident which the Novelty of it & the want of Experience might well occasion.
Page 11
is altered by the Pen to show its real State when it went off.
Page 12
Il avoit perdu son air inflammable par le Robinet qu'on avoit laisse ouvert expres pour empecher l'explosion a trop grande hauteur.
Page 13
--Transcriber's note-- A caret (^) indicates the following character or characters were printed in superscript.
Page 14
6, "M.