746346

Liber

vehic, denique pauciora, lcd majora propugna•

cula conftruir.

0¿_

1amvis hanc methodum in erfentialibus non

reprehendam , non video rarionem cur ira fecun–

dam alam negligic, quz camen

breviore1~

defcn–

lionein pra:bec ,

in qua cxcicari poílunt cor–

mcmorum fuggcfta , qua: vineam disjiciant.

ARCHITECTURJE

MILITARIS

LIBE R

SE C V N D V S·

De munitionibus regularibus.

.AJ.

femnda pars Arcbitec?ur.t

militatú,doc~t

methodttm muniendi (1tjt1fatmt¡tie

Polygoni reg11larú, excepto trigono, tf"ºd ;ta tnepwm

efl

ex natma fiea

111 milla

Arte corrigJ pojftt, mrmititmmlfque ta.ntttm ex1gr11 momenti propterea adk1be111r.

Polygonum autem reg11/are 1/111d

efl

Clt/

144

ang11it,& la1era

~qrialia

jiMt. C11m ergo

Jm/La irreg11lariltfJ ajfec7anda jit mji loct cm unjla1111a

ea~n

exigat

omniaque

m11nime11ta ad regulares

.!,_~

rtfJ

revocanda jint

;

h1c femndU1

l1ber etlam 1rregrel11rib111 erit

norma, mm irregttlaria

reg11~arib1U

d1rigantur.

Pra.xe~

comm11nes

.~r~pono_

, ~11m

experientia

compererim nihil omnino nrgbgend11m

hoc prttapue traElaw

1n prtmts accommodato,

qrei in armis trac7and11, magtJ qr111m in .(c1ent11J" verfantur. Nihil ergo fúppon!lm

nec ad

11/ia ab aliis !tbrtJ,

a111hor1bru petenda principia /e[/orem remittam. Notand11m a111em q11od

tj11amvú improbem eomm cunjili11m

q11i archite[/11ram mili1arem difficilimiJ Trigonomelri.:e

placitis implican/, qru. Tyronib111 m11lt11m

facefit

mgotii

quia lamen omnib111debitor

fi1m,

indicabo prob!emata

Trig~nometrica

q11ib11S exaEla /111eAYflm

ang11lomm menfora h11beaJ111':

qr1amviJ nemini authorjim

111 in iis immoret11r, eofve 1111di111 q111 c(ifllir1S in hfliefmodi tri-

CÍJ difcip11lo1 ji10J detinent.

~-ff!tff!f•@!fi&~M&iii9!

ff¡IJ-{ft@e

ff't

PROPOSITIO

Lineam perpendicularem ducere.

Ad lineam BC , per punfü1m A ducenda pcr–

pendicularis proponimr. Euclides propolitione

11.

libri primi, jubet hinc inde abfcindi lineas

a:quales AB, AC, apertoque circino ex punél:is

~-C m.ccn~ris

duos arcus eadem apertura def–

c.nb1 , qm fe m punél:o D imerfeccnt demonll:rat

lme?m DA perpendicularem clfe ad AB.

. !"fzc praxis fupra chartam bene focccdir, diffi.

cilius in folo perficitnr, nili ei aliquid addacur,

quare abfciffis hinc inde lineis a:qualibus AB,AC

cordam aliquam duplica nocaco punél:o medio ,

duo~ufque

extrcmiracibus in punll:is B

C fir–

;a11s' cordam zqualiter extendc , punél:um me–

d:~1.:1.~~~élo

D inliftec, eritque linea DA perpen-

Secunda praxis D proponic extra lineam, ex:

quo ducenda eft perpendicularis ad BC. Ex pun–

do D ur centro , defmbatu• circulus fecans li–

'[am.

/ / /.

neam BC in pun€tis B,

C, dividarnr linea BC

bifariam in A, linea D A perpendicularis eric. -

Hrnc praxin ira in folo exequeris. Nocam in me·

dio corda: duplicaia: inu{bm . in punll:o D collo–

cabis , cx:enliíque xqualicer corda: pambus, do–

ncc cxrremirares linea: BC infiíl:am, habcbuntur

punél:a B,

C. Diviíaqne linea BC bifariam in

A, habebicur pcrpendicularis DA,

Terrio

perpendicularis ducenda

lit

p·er pmt•

él:um A,in exrremicare linea: coníl:itutum: Ex quo–

libet punél:o D, incervallo DA deícribaturcircl1•

lus fccans lineam AB in punll:o B , ducacur reéh

BDC , fecans circulum in panél:o C , clarum

lineam CA perpendicularem elfe ad AB,

lea in

lo idem pra:íl:abis, duplicata corda, no–

tatoque punél:o ejus medio , extrema ejus in pun·

l\is

Il uccumque collocabis ,

habebifqu~

punél:um D , eandem cordam in lineam reél:am

BDC extende, per B

D cranfeumem exrende,

habebifque pun&lm C,

linea CA perpendícu·

la~is

cric . feu angulus CAB

.JI!

femicir~ulo

rellus

ene. Poffiunus ítem perperWftcularem m (olo

cere , fcmicirculo , íquadra, circino proporuo–

num , aliiíque inftmmencj¡, uc doccbirnus.

PROPO