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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( 36 )
If you take a Tube of a caniiderable
Length, and put a Quantity of Mercury
in, flop it at the Lower end., and immerfe
it in Water 14. Times as deep as the length
of the Mercury in the Tube^ and then
unftop the Lower-end, the Mercury will
not fall out, not wMilan.ding the Tube is
open at both Ends. If the Tube is im_
merjed deeper, th «Mercury yviUriie high-
er in the Tube:, which Demonflrates that
Fluids are prefs’d upwards aswell as down-
wards, (In Proportion to the height of
the Fluidabove, and the Gravity of the
lame,
'Now Air having a Property mit which
other Fluids have not, Imean the Elaftîc-
fpring which i'enders it Heterogeneous ;
thereforeit is in vain to attempt tolvlea-
fure the height of the Atmofpnere as we
do the height of other Tluiås, for we
may luppofe it to be lets denie higher in
the Air than it is near the Earth •, but a
Pillar ot this Air o£ any bigne/s is eaiily
weigh’d} as for Example,
We will fuppofe a PilJar ot .Air o£ 1%
Inches Diameter, fquav? t^le Diameter,
and multiply that ifom by and divide
it by jj., givesthe Area pretty near, than
multiply that Sum by zy, the height of
the Pillar ot Mercury, as will Balance
the Atmoiphere, and you have the con
tent