Benedetti, Giovanni Battista de, Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte]

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[397] Instrumentum oxigonium
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EMENDATIO CVIVSDAM FALSI MODI
delineandi
horologia Italica orizontalia.
Foanni Paulo Dardano.
MOdvs delineandi horologia Italica orizontalia, quem tibi monſtrauit
neſcio
quis, ni fallor, talis eſt.
Deſignato meridiano .l.b.m.q. ductisque; duo
bus
diametris .l.m. et .b. q, inuicem ad rectos in centro .g. quorum .l.m. ſit
verticalis
.b.q. vero orizontalis, ductoque; diametro .f.h. tropici Cancri ſe-
cundum
altitudinem poli datam, deſcriptoque; dimidio circulo .f.z.h. ipſius paralleli,
inuentoque; puncto .z. horæ propoſitę, & ab eo ducta per pendiculari .z.r. ad .f.h. & à
puncto
.r. ducta .r.o.y. parallela ad diametrum .q.b. orizontalem, ducis poſtea .f.ω. et .
r
.t.
vſque ad orizontalem .q.b. parallelas ad diametrum .l.m. verticalem.
Determi-
nato
poſtea gnomone .g.s. in orizontis axe, ductaque; vmbrarum linea .s.K. parallela
orizontali
, ductaque; .y.g.K. ad terminandam .s.K. delineas deinde ſeparatim circulum
q.x.b.n. magnitudinis prioris, qui quidem circulus ſignificet orizontem ipſum, in
quo
ductis diametris .q.g.b. et .l.g.m. accipis in diametro .q.g.b. puncta .a. et .ω. ita à cen­
tro
.g. diſtantia, vt ſunt in diametro orizontali prioris circuli, ducis poſtea per pun-
ctum
.a. lineam .x.a.n. ad rectos cum dicto diametro,
deinde per tria puncta .n.ω.x.
tranſire
facis circunferentiam circuli per quintam quarti Euclidis, poſtea in dicto dia-
metro
accipis punctum .t. ita diſtans à centro, & ex eadem parte, vt in priori circulo,
à
quo puncto ducis .t.u. parallelam .x.n. vſque ad circunferentiam .x.ω.n. in puncto .u.
quo
facto, ducis à centro .g. per punctum .u. ipſius circularis circunferentiæ .g.u. inde-
terminatam
, quam poſtea terminas in puncto .K. ita quod .g.K. æqualis ſit .s.K.
Dicis
poſtea
punctum .K. in eodem ſitu reperiri, reſpectu duorum diametrorum .q.b. me-
ridiani
. et .l.m. verticalis, vt decet, & oportet punctum horæ propoſitę exiſtere.

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