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 ij )
much the iefs as the Diameter of the
jlyfr ic leis ; and its Refinance is dîminiih-
edin the fame Radio as the Diameter of
the.J5ctf; and that iheremay bean Æ-
quilibrium. between -fhe XV eight and the
Power, it is always Requiiite that ( he Dia-
meter of the Wheel be to the Diameter
of the jfais in an Inverfe Ratio of the
Power-to "the Weight.
For Suppofe the Diameter
of -the jfais to be One F oof and the P«a-
meter of the Will’d SixYootî If the
weight D weigh $ix Hundred!?ounds and
the weight at B One Hundred pounds,
there will be an Jfyui librium, and if it
is required to raife the weight J), the
weig'hf at B mutt åelcend$ix Foot, in or-
derte» raiie ihe weight at D,one Toot
There are many foits of Machines to
raiie great weight, as the Pulley. &7c.
But -they are all grounded on -the Tame
Principles wich theie already mentioned
for if a great weight is. to be raifed by a
imall Power, this imall Tower murt go
thro’ the larger Space in Proportion, to the
inequality of the Tower with, the weight.
W<?, There ought -to be tome Allowance
aaded to the Tower that moves any ^Ma-
chine more than-theHuies ot We.chani.cks
mention, byKeafon ofFriÆon, which is
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