Galilei, Galileo, Les méchaniques, 1634

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<p type="main">
<s id="s.000210">
eſt attaché à F. </s>
<s id="s.000211">Mais quand la force D
<lb/>
ſouſtient la moitié du fardeau par le
<lb/>
moyen du leuier CD, elle a meſme
<lb/>
proportion à G que CD à CF, c'eſt à
<lb/>
dire ſouz double, donc le
<expan abbr="momẽt">moment</expan>
D eſt
<lb/>
double du moment de la moitié du
<lb/>
poids G qu'il ſouſtient, donc il eſt le
<lb/>
quart du moment des poids entier. </s>
</p>
<p type="main">
<s id="s.000212">L'on demonſtre la meſme choſe du
<lb/>
moment B, de ſorte qu'il eſt raiſonna­
<lb/>
ble que le poids eſtant également ſou­
<lb/>
ſtenu par les 4 poulies qui ſe voyent
<lb/>
dans cette autre figure, chacune porte
<lb/>
la quatrieſme partie du fardeau: ce que
<lb/>
ie monſtre en cette maniere. </s>
</p>
<p type="main">
<s id="s.000213">Que le poids X ſoit attaché au point
<lb/>
K par le moyen du mouffle KX, ie dy
<lb/>
que la force égale à la quatrieſme par­
<lb/>
tie du fardeau X, le ſouſtiendra, car ſi
<lb/>
l'on s'imagine que les deux diametres
<lb/>
BA & DE ſoient deux leuiers ſembla­
<lb/>
bles à ceux que nous auons expliquez
<lb/>
dans la figure precedente, & que le far­
<lb/>
deau ſoit ſuſpendu aux points CEF,
<expan abbr="l'õ">l'on</expan>
<lb/>
trouuera que les appuis, ou les ſupports
<lb/>
deſdits leuiers répondent aux points D
<lb/>
& A, conſequemment que la force ap­
<lb/>
pliquée en B ou en E ſouſtiendra le </s>
</p>
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