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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the Gravity of the Fluid m iuch Tube ;
Mercury will be forced about 2.9
and Water about 2,1 Foot; and'f ^.e
is drawn out of the lube ïio as
rife any higher than, to iuch h S
the weight of the Thiid, makes an Equi-
librium, with the weight ol t e
phere. , „ . „„
As Air is proved to ^ave GravKy ac-
cording to its Denftty, as wel1 aS °' of
Fluids; it is eafy conceived the Mtm
its preffmg, the Mercury inthe
-terto fuch a height, it >\n0 gi
Nature abhorsa Vacuum (as wnxe imagine)
for if that were the (We, there
be no Vacuum in the top, were the lube
of ever £0 great a Length.
The Jnftrumentcall’åtheBaromete , is
to find the weight of the Au- a+ fuch *
prefent Time, andtolhewthe difference
ot the weigh» at different Timeg the d
fèrent Preflure of the Atmofphere my
very well fuppoûd to be occasioned y
SyAkeratwn of the height, for « 1
other Fluids, the deeper they are the
greater the preffure at the Bot om.
To make thisMatternwre plain, take
-thß Example. Take a Barometer that 15
turn’d at the Bottom, (as they now com-
monly make ihem") as F‘g. 20- an jo
+ 0 the Bottom ofiome Pipe that
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