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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C 11 )
IT is poffible to make A Machine to hit
up an immenfe Weight with afmallString,
or evena Hair, but -then we wft take
Notice there muft be Time and Space in
Proportion to the weight of the Body to
be io raifed 3 for one general Rule to be
obferved in Mechanical Powers is, When
the Spaces gPne -through are in an 1b-
verfe Ratio of the Intenfities theA&ions
are equal.
DEMON S T R A T I O N.
will inftancein the Ballance-Beam,
a well-known Inftrument.
T-HS atiion of æ Weight to move a.
Ballance, is by fo mach greater, aS the
Point preffedbj the, Weight is more diftant
from the Center of the Ballance-, and that
' Action follows the Proportion of the Bifiance
of the fatd Point from the Center. When
the Ballance moves about its Center, the
Point B defcribes the Rrch B b "whilfi the
Point j\ deferibes the Brch A a, which iS
the blgreft of the Two y therefore, in that
Motion of the Ballance, the Bbti-on of the
fame Weight is different, according to the
Tointto which it is apfidd, andi't follows
the Proportion of the Space gene through
vide. Gra.vfanJs Introduffion to Philofophy.