Galilei, Galileo, Mechanics, 1665

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The third is a greater benefit, haply, then all the reſt that are
derived
from Mechanick Inſtruments, and reſpects the aſſiſtance
which
is borrowed of ſome Force exanimate, as of the ſtream of a
River
, or elſe animate, but of leſſe expence by far, then that which
would
be neceſſary for maintaining humane ſtrength: as when to
turn
Mills, we make uſe of the Current of a River, or the ſtrength
of
a Horſe, to effect that, which would require the ſtrength of five
or
fix Men.
And this we may alſo advantage our ſelves in raiſing
Water
, or making other violent Motions, which muſt have been
done
by Men, if there were no other helps; becauſe with one ſole
Veſſel
we may take Water, and raiſe, and empty it where occaſion
requires
; but becauſe the Horſe, or ſuch other Mover wanteth
Reaſon
, and thoſe Inſtruments which are requiſite for holding and
emptying
the Veſſel in due time, returning again to fill it, and one­
ly
is endued with Force, therefore it's neceſſary that the Mecha­
nitian
ſupply the naturall defect of that Mover, furniſhing it with
ſuch
devices and inventions, that with the ſole application of it's
Force
the defired effect may follow.
And therein is very great
advantage
, not becauſe that a Wheel or other Machine can enable
one
to tranſport the ſame Weight with leſſe Force, and greater
Dexterity
, or a greater Space than an equall Force, without thoſe
Inſtruments
, but having Judgment and proper Organs, could have
done
; but becauſe that the ſtream of a River coſteth little or
nothing
, and the charge of keeping of an Horſe or other Beaſt,
whoſe
ſtrength is greater then that of eight, or it may be more
Men
, is far leſſe then what ſo many Men would be kept
for
.

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