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# Title: Francisci Dulaurens Specimina Mathematica Duobus Libris Comprehensa (shelfmark Leibn. Marg. 134)
# Folio 82, page id 1066520976:0102
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82
aequibilecandis, nec non mediis proportionalibusinre
niendis abhibetur, ut suo loco ostendemus; et uc uno
verbo cuncta ejus ofticia complectar bona pars propoli-
tionum feometricarum perpendicularis auxilio indiset,
vel ad constructionem, rel ad demonstrationem.
SPECEMENUM M A YETEM AFTCORUM
Ouando perpenatmum. in quo sumpta fuerint aliqua
puncta transverpm, es urrimque supra subjectam suam mo-
veri sic intellicirur, ut a directo cum ea situnu spiam in mo-
tione sua deflectat, accepra puncta cum dicto perpendiculo
lata fuxu suo rectas describent, quae tum inter (e, tum adt
subjectam parallelae, sive aequidistantes vocansur.
Vel (C, Parallelae, sive aequidistantes lineae dicuntur, qua
cum inter se distent, nusquam tamen ad se invicem accedunt.
aut a se invicem recedunt, sed per aequidistantia semper inter-
valla porricuntur.
Vel adhuc, Parallelae, sive aequidistantes lineae dicun-
tur, inter quas aequialtum ubique mediat intervallum.
VARE parallelismus sire x quidistancia cAt in magni
cudinibus, quoris incerrallo à se invicem distanci-
bus inrariatio, sive immucabilitas distantix per toram
intervalli lacicudinem; vel est perperuus ejusdem distan-
eic cenor, per coram existentis inter semoras magnicudines
Spacii laricudinem alcicudinemre constantissime serracx.
EXPLICATIO.
FAo LLD, supra basim AB crectum, in quo su-
D..
mantur quorlibet puncta FI
e D. Dictum aurem jum
CD cranlversim, hoc est se
cundum Cuam lonsicudinem.
ec uerimque, nimirum versus
OpPOSICASPATEES A _ B, supra
nominatam rectam AB in-
remoreri, ut a duceo cum ea licunuspiam
ex
270.
celsisaru