Clavius, Christoph
,
Geometria practica
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GEOMETR. PRACT.
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nebitur altitudo A E, vel latus AD, in diſtantia ſecundum hunc numerum 500.
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</
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<
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xml:space
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">dent Quotientem 500. </
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<
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xml:space
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">At vmbra verſa trium mille-
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ſimarum dabunt Quotientem 333 {1/3}. </
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<
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<
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xml:space
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quo intelligi licet, quando vmbra verſa abſciſſa valde parua eſt, magnum poſ-
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ſe errorem committi in diſtantia inueſtiganda. </
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<
s
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xml:space
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perexiguæ, facilè decipi poſſumus, vt nimirum putemus, ab ſciſſas eſſe tres mil-
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leſimas, cum fortaſsis ſolum duæ abſciſſæ ſint: </
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<
s
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xml:space
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terit 166 {2/3}. </
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<
s
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xml:space
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">altitudinem AE, vellaterum A D, qui error contemnendus non eſt. </
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At quando partes vmbræ verſæ plures milleſimas continent, non tantus error
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committitur, etiamſi vnam milleſimam pro altera accipiamus. </
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<
s
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xml:space
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">Nam ſi verbi
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gratia putemus, ab ſciſſas eſſe partes {30/1000}. </
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<
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xml:space
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">ex vmbra verſa, cum verè abſciſſæ
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ſint {31/1000}. </
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<
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">error fieri poterit ſolum in 1. </
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<
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xml:space
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">altitudine A E, vellatere A D, & </
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cum {30/1000}. </
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<
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Itaque magis probo, vt Quadratum in altiori loco ſtatuatur, quam in plano
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Horizontis, quia ibi plures partes vmbræ verſę abſcinduntur, quam hic, vt con-
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ſtat in diſtantiis æqualibus E F, D M. </
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<
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xml:space
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">Vides ergo magnam eſſe adhibendam
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diligentiam, vt accuratè partes milleſimæ rep eriantur per ea, quæ lib. </
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<
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Num. </
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<
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verò, ſi quadratum conſtructum ſit ad certam aliquam menſuram, hoc
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eſt, vt latus contineat vel 1. </
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<
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</
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">&</
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<
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<
s
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">res erit expeditiſsima, ſi ſemel tantum latus particularum 1000. </
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catur in menſuras, quibus latus æquiualet. </
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quirendis, ſi quadratum ſupra planum, in quo eſt longitudo, ſtatuatur, (vt fit
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in omnibus hypotenuſis, ſiue diſtantiis à loco menſoris vſque ad aliquod pun-
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ctum menſore ſublimus, depreſsiuſue, quemadmo dum patuitin proxima figu-
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ra, quando longitudo D M, inquiſita eſt, patebitque in ſcholio problematis 7. </
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& </
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Num. </
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<
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denique in problem. </
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<
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<
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<
s
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">in aliis locis) diuidendus ſolum eſt numerus
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productus per partes vmbræ verſæ (quæ ſemper abſcinditur) notatas. </
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<
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tiens enim dabit longitudinem quæſitám in data menſura. </
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<
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">Verbigratia, ſi in vno
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latere comprehendantur 3. </
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<
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">pedes, multiplicabimus latus 1000. </
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<
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">per 3. </
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<
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">efficie-
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muſque 3000. </
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<
s
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xml:space
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">Ita que ſi in inueſtiganda longitudine quapiam abſciſſæ ſint par-
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tes 200. </
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<
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">ex vmbra verſa, partiemur 3000. </
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<
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<
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<
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pedes pro quæſita longitudine. </
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<
s
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xml:space
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"> Nam cum in proxima figura ſit, vt
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verſa NB, 200. </
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<
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">ad latus BA, 1000. </
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<
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<
s
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">pedum ad DM, multiplican-
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dum eſt latus 1000. </
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<
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<
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<
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<
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">per 200. </
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<
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dus. </
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<
s
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">Eademque decæteris ratio eſt. </
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<
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xml:space
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">Sic ſi latus contineret {1/2} cubiti, diuidendu@
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eſſet numerus 500. </
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>
<
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xml:id
="
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">ex {1/2}. </
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<
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">in 1000. </
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<
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">procreatus per vmbram verſam. </
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>
<
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">Pari ratio-
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ne ſi latus complecteretur 10. </
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<
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">palmos, diuidendus eſſet numerus 1000. </
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<
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">genitu@
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ex 10. </
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<
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">in 1000. </
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<
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">per vmbram verſam: </
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<
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@udine contenti, &</
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<
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">c. </
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<
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">quod non indiligenter notandum eſt.</
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<
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<
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diſtantia metienda magna eſt, & </
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<
s
xml:id
="
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xml:space
="
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">adeſt bona planities campi,
<
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vti poterimus Quadrato ſtabili commodiſsimè hoc modo. </
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<
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="
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