Clavius, Christoph
,
Geometria practica
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LIBER TERTIVS.
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indein duab. </
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<
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">regulis BC, CD, ducantur tres parallelæ extremitatibus quadrati,
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& verſa in
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quadrato quæ,
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& in quot par
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tes à Geome-
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tris vtraque
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ſecetur.</
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pro partibus & </
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<
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xml:space
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">numeris vtriuſque vmbræ deſignandis, vt in figura apparet. </
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<
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xml:space
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tus BC, vmbræ rectæ, & </
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<
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">CD, vmbræ verſæ deſtinatur à Geometris: </
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115-01
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http://echo.mpiwg-berlin.mpg.de/zogilib?fn=/permanent/library/xxxxxxxx/figures/115-01
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autem in 12. </
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<
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">partes æquales partiri ſolent omnes, qui de vſu Quadrati Geome-
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xml:space
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">In quot part{es}
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vtraque vm-
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brain noſtro
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quadrato di-
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uidatur.
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Scala altime-
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tra quid.</
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triciſcrip ſerunt: </
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<
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">Et ſi capacitas inſtrumenti permittit, ſingulas partes in 60. </
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diuidunt, vt tota vmbra partes 720. </
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<
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">complectatur, vel in 100. </
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">in
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vtraque vmbra exiſtant. </
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<
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xml:space
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">Ego vtramque vmbram in 10. </
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<
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xml:space
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">partes duntaxat æqua-
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les diuido, niſi inſtrumentum ſit tantæ magnitudinis, vt commode vtra que re-
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cta BC, CD, in 100, aut 1000. </
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<
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">partes ſecari poſsit, ſub diuiſis videlicet ſingulis
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decimis partibus in 10. </
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<
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ſtans dici ſolet à Geometris Scala altimetra.</
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<
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autem diuiſioni conſuetæ in 12. </
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<
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<
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<
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">Quare noſtr
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diuiſio vmbr
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præferatur a-
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liorum diui-
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ſioni.</
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diuiſionem noſtram in partes 10. </
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<
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<
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<
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">æquales, propterea quòd, ſi
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inſtrumentum propter paruitatem ſectum ſit tantummodo in 10. </
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<
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admodum negotio cognoſcere poſſumus, quot centeſimæ, vel etiam milleſi-
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mæ partes in qualibet particula cuiuſcunque partis decimæ rectarum B C, CD,
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aſsignata comprehendantur: </
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</
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<
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quod in dimetiendis lineis per Quadratum Geometricum fieri ſemper debeat
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multiplicatio, aut diuiſio per omnes partes lateris BC, vel CD: </
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<
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tem eſt, faciliorem eſſe multiplicationẽ, diuiſionemue per 10. </
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<
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quàm per 12. </
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<
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<
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<
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detractionem 0. </
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<
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<
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mus.</
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<
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quidem latus quadrati à do ctiſsimo
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10. </
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<
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ſum quo que eſſe, & </
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<
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<
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<
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ab eo regula non tradatur, qua cognoſcendũ ſit, quot partes mill eſimæ in qua-
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uis particula vnius centeſimæ comprehendantur, quod tamen omnino neceſ-
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ſarium eſt, vt dimenſiones, ac ſtellarum altitudines exquiſitè obſeruentur: </
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<
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ſertim ſi propter inſtrumenti paruitatem latus in 10. </
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<
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poſsit diuidi. </
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<
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">Id quod per noſtram do ctrinam, vt diximus, ſine magno laborè
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effici poteſt.</
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