Clavius, Christoph
,
Geometria practica
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(1.)
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LIBER PRIMVS.
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quælibet pars contineat {10/10}@ vnius centeſimæ.) </
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>
<
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xml:id
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">hoc eſt, {80/1000}. </
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<
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xml:space
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">& </
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<
s
xml:id
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"
xml:space
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">{7/10}. </
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<
s
xml:id
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"
xml:space
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">vnius cen-
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teſimæ contineant {7/1000}. </
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<
s
xml:id
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xml:space
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">comprehendet tota linea abſciſſa {87/1000}. </
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<
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xml:space
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">Item ſi quis
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cupiat {17/1000}. </
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<
s
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xml:space
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">accipienda erit vna pá
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rs ipſius A F, & </
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<
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xml:id
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xml:space
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<
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cundæ, vt paulo ante dictum eſt. </
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<
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<
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<
s
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xml:space
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">partibus ex
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K L, transferemus easin A F. </
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<
s
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xml:space
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<
s
xml:id
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xml:space
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">Nam abſciſſæ partes erunt
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7 {7/17}. </
s
>
<
s
xml:id
="
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xml:space
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">Vna ergo pars cum {7/10}. </
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<
s
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">continebit {17/1000}. </
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<
s
xml:id
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xml:space
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">Denique ſi optentur {457/1000}. </
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<
s
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mendæ erunt exrecta A F, partes 45. </
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<
s
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">cum hæ æquiualeant {450/1000}. </
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<
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xml:space
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">Deinde {7/10}.
<
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</
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<
s
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xml:space
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">ex ſequenti parte quadrageſima ſexta, beneficio ſeptem particularum rectæ
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K L, &</
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<
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<
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<
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ergo ſinus totus ponatur 1000. </
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<
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xml:space
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">habebuntur Tangentes, vt in ta-
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bula nouæ deſcriptionis horologiorum poſitæ ſunt, nulla figura abiecta. </
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<
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<
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xlink:label
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">Tangentes
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quo modo in-
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inueniantur,
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poſito ſinu toto
<
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100.</
note
>
quando Tangens maior eſt quam 1000. </
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<
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="
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xml:space
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">relictis millenis, accipendæ ſuntre-
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liquæ partes milleſimæ pro Tangente, eiq; </
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>
<
s
xml:id
="
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xml:space
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">toties ſinus totus addendus, quo-
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<
handwritten
xlink:label
="
hd-037-01
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xlink:href
="
hd-037-01a
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number
="
7
"/>
ties vnitas in millenis relictis reperitur. </
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>
<
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xml:space
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">Vt ſi quis velit Tangentem Grad. </
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<
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</
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<
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<
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">30. </
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<
s
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">quæ in tabula eſt 854. </
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<
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">accipiendæ ſunt in regula A F, partes 85. </
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<
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xml:space
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">& </
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<
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<
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{4/10}. </
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<
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">vnius. </
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<
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xml:space
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">Ita enim Tangens continebit partes 854. </
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<
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">ex 1000. </
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<
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">At ſi quæratur
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Tangens Grad. </
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<
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<
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<
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">0. </
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<
s
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">quæ in tabula eſt 5671. </
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<
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">relictis millenis accipien-
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dæ ſunt partes 67. </
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>
<
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xml:space
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">& </
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<
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">{1/10}. </
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<
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">vnius partis, & </
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<
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">Tangenti 671. </
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<
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tus quinquies.</
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<
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</
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<
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<
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<
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ratione ſi adhibeatur recta M N, partium 101. </
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<
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<
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">de-
<
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<
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xlink:label
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xml:space
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">Decimæ par-
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tes milleſima-
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rum quo mo-
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do ſumantur,
<
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etiam ſi inſtru
<
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mentumdiui-
<
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ſum ſit in 100.
<
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part{es} dunta-
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x{at}.</
note
>
promemus ex recta A F, partes decimas milleſimarum; </
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<
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cula rectæ M N, contineat vnam particulam ipſius A F, ſemel, & </
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<
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{1/100}. </
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<
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xml:space
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">Ita vt quælibet particula rectæ A F, diuiſa eſſe cogitetur in 100. </
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<
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las; </
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<
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">ac proinde tota A F, ſit 10000. </
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<
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">particularum, quod eodẽ modo demon-
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ſtrabitur. </
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<
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">Eſt enim eadem proportio M N, ad vnam particulam ſuam cente-
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ſimam, quæ rectæ A F, ad vnam ſuam centeſimam, &</
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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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>
hac ratione haberi poterunt Tangentes, poſito ſinu toto
<
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10000. </
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>
<
s
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xml:space
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">abiectis nimirum tribus figuris primis ex Tangentibus tabulæ in no-
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ſtro Theodoſio deſcriptæ. </
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<
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xml:space
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<
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<
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">Min. </
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<
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">30. </
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<
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">quæ
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in tabula (abiectis tribus figuris) eſt 49151. </
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>
<
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">relictis denis millenarum, acci-
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<
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="
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xlink:label
="
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xlink:href
="
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xml:space
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">Tangent{es} p@-
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ſito ſinu toto
<
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10000 quo pa-
<
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cto ſumãtur.</
note
>
piemus partes 9151. </
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>
<
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">nimirum partes 91. </
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<
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<
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">regulæ A F, & </
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>
<
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">{51/100}. </
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<
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">vnius.
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</
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<
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">quod fiet, ſi partes 51. </
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<
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">rectæ M N, transferantur in A F. </
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<
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xml:id
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xml:space
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">Circinus enim vltra
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partes 51. </
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<
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xml:id
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"
xml:space
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">abſcindet {51/100}. </
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>
<
s
xml:id
="
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"
xml:space
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">Nam quia ſingulæ particulæ rectæ A F, concipiun-
<
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tur ſectæ in 100. </
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<
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xml:id
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xml:space
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">particulas, continebuntur in 91. </
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<
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<
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<
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quibus ſi addantur 51. </
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<
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xml:id
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xml:space
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">habebitur Tangens 9151. </
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>
<
s
xml:id
="
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xml:space
="
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">Huic tandem apponendus
<
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eſt ſinus totus quater, propter quatuor denas millenarum relictas, Facile au-
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tem ad 91. </
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<
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xml:id
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">partes adijcies particulam continentem {51/160}. </
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>
<
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xml:id
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xml:space
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">vnius centeſimæ, ſi
<
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eam, (quæ nimirum vltra partes 51. </
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<
s
xml:id
="
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xml:space
="
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">regulæ A F, exiſtit) cum vna parte regu-
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læ A F, transferas, vt pes circini inter partes 91. </
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<
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="
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">& </
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<
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">92. </
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<
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">cadat, hoc eſt, ſi eam
<
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cum vna parte transferas ex parte 90. </
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<
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">vel cum duabus partibus, ex parte 89. </
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<
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<
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&</
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<
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">c.</
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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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style
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>
porro Tangente in vtraqueregula A F, A G, dabit inter-
<
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<
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position
="
right
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xlink:label
="
note-037-04
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xlink:href
="
note-037-04a
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xml:space
="
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">Qua ratione
<
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/>
ex inuenta
<
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/>
parte milleſi-
<
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ma, vel deci-
<
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/>
{es} mill@-</
note
>
uallum inter Tangentem regulæ A F, & </
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>
<
s
xml:id
="
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"
xml:space
="
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">Tangentem regulæ A G, eandem
<
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Tangentem reſpectu ſinus totius F G.</
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>
<
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</
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<
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<
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">9. </
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<
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<
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="
sc
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emph
>
autem Tangens tam exigua eſt, vt eius interuallum prope
<
lb
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punctum A, accipinequeat, vtemur hoc artificio. </
s
>
<
s
xml:id
="
echoid-s510
"
xml:space
="
preserve
">Sit verbi gratia </
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p
>
</
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>
</
text
>
</
echo
>