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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S?,n? ToP of fome Edifice, and being
rill ci with Water, will drive the Mercury
totheTop oftheGhfs-Tube, by reafon
oi the weight of the Pillar of Water and
Atmofphere, both prefs on the Mercury
but unflop the ton ofthe Tube at A, ana
the Air will prefs equally upon A Ändß.
therefore the PJhr Mercury give$
the Weight ot the Pillar ot' Water, only
oi the tørne bignefs of th* Tube A fur
let the Pillar of Water be of ^hal ’big,
felÄ foever, the PiJiar of Mercuty 3a/.
lances no more than a PilJir of its own
1gne/i for the Reafous laid down in the
p^- Andifyou
audto, or dwiinnh front the top of the
lube B„ the Mercury will ïe/péétivJy
nfe or lall one if tn of the length add-
ed tv, or Æminuhød from- the Tube B.
Note. The Mercury is tu be meiftired
from the Horuantal Line frpmthe tup of
the JVier.ury in the fhort End of the
GIai$ Tube*, the Water in B will Ihnd
14. times as high as the Mercury in .A ;
Tneretbre it you Meaftire the height of
the -Mercury, and have reevune to the
aole of opecitlck Gravity, you may cal-
cinate the height of this Pillar of water
and the weight of the lame.