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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( 24 )
But in this they are “Miftaken- for Bodies
are only relatively Light or Heavy accor-
ding as They are compared with others of
a different Kind: So that Plame or&noak
afcendnot, beeauie they are really Light,
but because they are buoyed up by the
Air, which is more Denfe, and in its
Nature heavier than they s for Tlarne
in Vacuo will Toon fubfide, anci 5moak
when the Fuliginous parts thereof become
heavier t h an the Medium rpundthem^,-will
vifibly Jefeend: Thus Oyl and Wine do
not fivixn on Water becauft of their own
Levity, but becaufe Water is, a heavier
Fluid, and finks in them. In jAir mo-ft
Bodies fink became it is very Light -, in
Waler not fo many, it being far more
Deme; in Mercury fear ce any may be to-
tally immerfed from the like Quie •. forig
there any greaterKeafon that Cork ïhould
be termed Light becaufe ’twill Swim in
Water, than that Iron ihould be edeem-
ed fo becaufe ’twill Swim in Mercury.’7
In genera], therefore, one Body is faid
lobe fpecifirally Heavier or Denier than
another when it conrains more Matter, or
a greater degree of Weight under -the
fame or an equal Bulk, or an. equal Degree
of Weight in lefs Space or Conipafs: Tor
Inïhnce, A Cubïck Inch oi Gold weighs
ten