Bion, Nicolas
,
Traité de la construction et principaux usages des instruments de mathématique
,
1723
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DE DIFFERENS INSTRUMENS. Liv.III.Ch.II.
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ce ou d'une livre, le crochet pour le ſuſpendre y compris; </
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<
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xml:space
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">& </
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<
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xml:space
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">pour
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trouver le poids & </
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<
s
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xml:space
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">le prix de la marchandiſe, faites la même choſe
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que vous avez faite avecle fil de ſoie, & </
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<
s
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xml:space
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">en ôrcz celui d'une livre
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ou d'une once, quieſt le poids du baſſin.</
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<
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<
s
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xml:space
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">La livre dont on ſe ſert à Paris eſt de 16 onces, & </
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<
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">ſe diviſe en 2
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marcs, chacun de 8 onces; </
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<
s
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">l'once ſe ſubdiviſe en 8 gros, le gros
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en 72 grains, & </
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<
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">le grain, qui eſt à peu près le poids d'un grain de
<
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froment eſt le plus petit poids qui ſoit en uſage.</
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<
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</
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<
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<
s
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xml:space
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">Le quintal peſe cent livres.</
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</
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</
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<
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">Rapports du poids de 'Paris à ceux des Païs étrangers.</
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<
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<
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">LA livre d'Avignon, Lyon, Montpellier & </
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<
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">Thoulouſe peſe 13
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onces.</
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<
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</
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<
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<
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">La livre de Marſeille & </
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">de la Rochelle de 19 onces.</
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</
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<
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<
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">La livre de Roüen, Beſancon, Stra@bourg & </
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<
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">Amſterdam peſe
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16 onces, comme celle de Paris.</
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<
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<
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">de Gennes peſe 9 onces 3 quarts.</
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<
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">La livre de Florence, Ligourne, Piſe Sarragoſſe, Valence peſe
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10 onces.</
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</
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<
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<
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">de Modene peſe 10 onces & </
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<
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<
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<
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<
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">La livre de Baſle, Berne Francfort, Nuremberg peſe 16 onces
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& </
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</
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<
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<
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<
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<
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<
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<
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">Fig. F.</
note
>
de deux chapes; </
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">dont chacune porte huit poulies creuſées dans
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l'épaiſſeur d'un petit canal pour recevoir la corde & </
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<
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ſe détourner. </
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<
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">Elle eſt attachée par un bout à la chape ſuperieure, & </
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après avoir ſait le contour de toutes les poulies, l'autre bout de la
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corde ſe joint à la puiſſance repreſentée par une main. </
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<
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">Quatre de ces
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poulies ſont portées par un même eſſieu, & </
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<
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">quatre par un autre,
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auſſi-bien dans la chape ſuperieure que dans l'inferieure. </
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<
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de la chape d'en haut il y a un anneau pour attacher la machine en
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un lieu fixe, & </
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<
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neau pour attacher le poids.</
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<
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<
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">L'uſage de cette machine eſt pour élever ou attirer à ſoi de gros
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fardeaux, en multipliant la force de la puiſſance, laquelle augmente
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