Bélidor, Bernard Forest de
,
La science des ingenieurs dans la conduite des travaux de fortification et d' architecture civile
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<
1 - 30
31 - 60
61 - 90
91 - 120
121 - 150
151 - 180
181 - 210
211 - 240
241 - 270
271 - 300
301 - 330
331 - 360
361 - 366
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LA SCIENCE DES INGENIEURS,
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qu’on a regardé long-tems la Deſcription de la Volute comme un
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Problême fort interreſſant. </
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rentes dont la pratique eſt aiſée, mais peu exactes, ainſi que plu-
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ſieurs autres, dont je ne ferai pas mention.</
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<
s
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xml:space
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">Le plus ſûr moyen d’inſtruire un Lecteur à peu de frais, étant de
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lui mettre d’abord ſous les yeux ce qu’il y a de meilleur, je me
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contenteray de raporter ſeulement la Volute de Goldman, qui eſt
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la plus eſtimée de toutes celles qu’on a imaginées juſqu’ici, parce
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qu’elle ſe décrit Géometriquement auſſi-bien que le Liſtel ou
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Volute interieure.</
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<
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<
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.
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42.</
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vir à régler l’Ordonnance Ionique, on le diviſera comme je l’ai déja
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<
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. 5.</
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dit en 18 parties égales, on tirera une ligne AB, à laquelle on don-
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nera 16 de ces parties, ou ſi l’on veut un module moins 2 parties,
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enſuite on déterminera dans cette lignele point E enſorte qu’il ſoit
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éloigné de 9 parties de l’extrémité A, & </
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point ſera le centre de l’œil de la Volute, & </
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on décrira un Cercle quiaura pour centre le point E, & </
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une partie, alors le diamêtre CD ſera de 2 parties, la ligne CA
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de 8, & </
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<
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lement aux points 1 & </
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faire le quarré 1. </
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ference du Cercle, on tirera les lignes E 2 & </
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la Baſe 1. </
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</
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ligne 9. </
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conſéquent 12 angles droits qui donneront 12 centres dont nous
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nous ſervirons après avoir prolongé les côtés des quarrés indefi-
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niment dans le ſens qu’on le voit ici.</
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<
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l’intervale 1 A, décrire le quart de Cercle AF, du centre 2. </
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l’intervale 2. </
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vale 3. </
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4. </
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<
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le quart de Cercle QG, du centre 6. </
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de Cercle GI, du centre 7. </
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<
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<
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xml:space
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cle IN, du centre 8 & </
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<
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du centre 9. </
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tre 10. </
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<
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tre 11. </
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<
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<
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