Galilei, Galileo, Les méchaniques, 1634

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leurs plans. </s>
<s id="s.000240">Ce que Pappus
<expan abbr="Alexãdrin">Alexandrin</expan>
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s'eſt efforcé de monſtrer dans le 8. liure
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de ſes Collections Mathematiques,
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mais il s'eſt trompé, à mon aduis, en ce
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qu'il a ſupposé vne force donnée pour
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mouuoir le poids ſur le plan
<expan abbr="horizõtal">horizontal</expan>
,
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ce qui eſt faux, parce qu'il ne faut nulle
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force ſenſible, ſi l'on oſte les empeſche­
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mens exterieurs. </s>
<s id="s.000241">C'eſt pourquoy il eſt
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plus à propos de chercher la force qui
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meut le fardeau ſur le plan vertical ou
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perpendiculaire AF, laquelle eſt tou­
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ſiours égale à la peſanteur du fardeau,
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que de chercher la force qui le meut
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ſur le plan horizontal. </s>
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<s id="s.000242">Soit donc le cercle AIC, dont le dia­
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mettre
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eſt ABC,
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& le cen­
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tre B; &
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qu'il y ait
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deux for­
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ces éga­
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les aux
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points A
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& C, qui
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<expan abbr="repreſẽtẽt">repreſentent</expan>
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vne
<expan abbr="balãce">balance</expan>
mobile autour du centre B, </s>
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