Clavius, Christoph, Geometria practica

Table of Notes

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page |< < (42) of 450 > >|
7242GEOMETR. PRACT. tria autem Min. in 4. gradu, ſi tres particulæ transferantur, & ſic decæteris.
14. Qvæ Num. 13. præcedenti diximus, perbelle etiam quadrant in lineas
11Quo pactore-
peri
atur fra-
ctio
cuiuſque
particulæ
in
parte
qualibet
lineæ
rectæ in
part
{es} æqual{es}
diuiſæ
.
rectas.
Nam eadem ratione cognoſcemus, ſi linea recta in quotuis partes æqua-
les
ſecetur, quantam fractionem quælibet particula vnius partis contineat:
Et
viciſsim
quo pacto ex vna parte abſcindenda ſit quæcun que fractio propoſita.
Quæ res incredibile eſt, quantam vtilitatem cum alijs rebus Geometricis, tum
ver
ò maxime Dimenſionibus, quæ per ſcalam altimetram fieri ſolent, afferat, vt
lib
.
3. cum de Quadrato Geometrico, vbiſcalæ altimetræ vſus apparebit, perſpi-
cuum
erit.
Sit enim recta linea A B, vt ad pedem Quadrantis ſuperioris vides,
ſecta
in 10.
partes æquales. (In totenim partes libet tam vmbiam rectam, quam
3737[Handwritten note 37] verſam ſcalæ altimetræ diſtribuere:
quamuis ab alijs vtraque in 12. diuidatur:
quod per illam diuiſionem facilius Dimenſiones perficiantur, vt ſuo loco pate-
bit
.
Magis tamen probarem, ſi vtrumque vmbræ latus in 100. partes ſecare-
tur
, ſi id magnitudo inſtrumenti commode permittit) propoſitumque ſit, quot
partes
decimas contineat particula D C, partis quintæ.
Beneficio circini ſum-
pta
paiticula D C, decupletur ab A, vſque ad E.
Et quoniamin A E, continen-
tur
ſex partes totius lineæ A B, continebit propterea particula D C.
{6/10}. vnius
partis
decimæ, hoceſt, {6/100}.
totius lineæ. Ita vt ſirecta A B, diuiſa cogitetur in
100
.
partes, tribuendo ſingulis decimis partibus denas particulas, ſegmentum
A
C, comprehendat {46/100}.
Quia vero vltra {6/10}. ſupereſt adhuc particula F E,
vnius
decimæ, ſi ea rurſum decupletur ab A, vſque ad G, reperientur in A G,
octo
partes totius lineæ A B.
Continet ergo particula F E, {8/10}. vnius decimæ,
hoc
eſt, propoſita particula D C, vltra {6/10}.
vnius partis rectæ A B, continet in
ſuper
{8/10}, vnius decimæ, (vnius inquam decimæ ex illis {6/10}.
quas in particula
D
C, diximus comprehendi) nimirum {8/100}.
vnius partis. ſi ſingulæ partes deci-
mærectæ
A B, diuiſæ eſſent in 100.
particulas; atque adeo, ſi recta A B, ſecta
intelligatur
in 1000.
partes, tribuendo ſingulis decimis partibus centenas par-
ticulas
ſegmentum A C, complectetur {468/1000}.
quippe cum in A D,

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