The First Steam-Boat
Forfatter: Jonathan Hulls
År: 1860
Forlag: E. & F. N. Spon
Sted: Bucklersbury
Sider: 48
UDK: 629.120(09)
Description And Draught Of A New-Invented Machine For Carrying Vessels Or Ships Out Of, Or Into Any Harbour, Port, Or River, Against Wind And Tide, Or In A Calm.
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tent o£ cubical Inches of Mercury, then
multiply that Sum by the Ounces in a cu-
bical Inch of Mercury., and yi ou Have the
Ounces in tHe whole Tillar, win ch may
be brought into Pounds and Hundreds,
therefore by this Calculation, a Column
of Air of this bignefs weighs near lyHun-
dred weight, and by this Proportion the
weight oL Pillar o^ir^ny Dwneter
m The weight of a Pillar of two Fo^is
near four Times the weight of one that
is but one Toot, for the weight is m Pro-
portion to theSquares oftheirThameters,
or if youfquare the Diameter and multiply
it by 1% it ïs pretty near the Truth. Rec-
kon the Mercury at 29 Inches, it will be
but 1649 pounds which matø it 172,0,
but this, dference arifts from reckoning
the Mercury but 29 Inches, whereas ü: is
fbmething more, except in W Weathe»,
a Tillar ot-Air of a 9 inches Diameter will
be found W weigh z r?on, z Hundred, 3
Quarters 1ft Pounds-, likewise iTilhr
O? Air Of 30 Inches Diameter weighs 4
Ton, lé'Hundred and ao”Poun<l.
If a Man’s Body were to bear the
weight of the ^mofphere in proportion
to the foperficial content oi his My (as
has been ïmagmed) the Strength of hxs
t> Bones