Galilei, Galileo - Mechanics

Galilei, Galileo, Mechanics, 1665

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wherewith it ſelf doth move; which we affirm abſolutely to be
impoſſible to be done with any Machine imaginable. But becauſe
it may ſometimes come to paſſe, that having but little Force, it is
required to move a great Weight all at once, without dividing it
in pieces, on this occaſion it will be neceiſary to have recourſe to
the Machine, by means whereof the propoſed Weight may be
transferred to the aſſigned Space by the Force given. But yet
this doth not hinder, but that the ſame Force is to move, meaſuring
that ſame Space, or another equall to it, as many ſeverall times as
it is exceeded by the ſaid Weight. So that in the end of the a-
ction we ſhall ſind that we have received from the Machine no
other benefit tnen only that of tranſporting the ſaid Weight with
the given Force to the Term given, all at once. Which Weight,
being divided into parts, would without any Machine have been
carried by the ſame Force, in the ſame Time, through the ſame
Intervall. And this ought to paſſe for one of the benefits taken
from the Mechanicks: for indeed it frequently happens, that be-
ing ſcanted in Force but not Time, we are put upon moving great
Weights unitedly or in groſſe: but he that ſhould hope, and at-
tempt to do the ſame by the help of Machines without increaſe of
Tardity in the Moveable, would certainly be deceived, and would
declare his ignorance of the uſe of Mechanick Inſtruments, and
the reaſon of their effects.

Another benefit is drawn from the Inſtruments, which depend-
eth on the place wherein the operation is to be made: for all In-
ſtruments cannot be made uſe of in all places with equall conve-
nience. And ſo we ſee (to explain our ſelves by an example) that
for drawing of Water out of a Well, we make uſe of onely a
Rope and a Bucket fitted to receive and hold Water, wherewith
we draw up a determinate quantity of Water, in a certain Time,
with our limited ſtrength: and he that ſhould think he could with
a Machine of whatſoever Force, with the ſame ſtrength, and in
the ſame Time, take up a great quantity of Water, is in a groſſe
Errour. And he ſhall find himſelf ſo much the more deceived,
the more he ſhall vary and multiply his Inventions: Yet never-
theleſſe we ſee Water drawn up with other Engines, as with a Pump
that drinks up Water in the Hold of Ships; where you muſt note
that the Pump was not imployed in thoſe Offices, for that it draws
up more Water in the ſame Time, and with the ſame ſtrength
then that which a bare Bucket would do, but becauſe in that place
the uſe of the Bucket or any ſuch like Veſſel could not effect what
is deſired, namely to keep the Hold of the Ship quite dry from e-
very little quantity of Water; which the Bucket cannot do, for
that it cannot dimerge and dive, where there is not a conſiderable
depth of Water. And thus we ſee the Holds of Ships by the

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