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:Architeél:ur~

Militaris:

Angulus defenfus duas tenias haber

anguli

polygoni, atque adeo in IV.

60.

In V. 73 .

VI.So.

Vil.

86.

Vlll.

90.

íicur

&

czrera.

Tertia 111ethod11S Hollandica.

Cortina 71.

Facies 48.

Augulus dcterminans alam

40.

Angulus defeníus dimidio angulo polygoni

addit

20

gradus, arque adeo IV. haber

65.

V.75. ·

VI. So. VII. 84. V111. 87.

7

rcliqua

90.

~arta 1nethod1~J

Htil/andiC1t,

Cortina 7»

Facies 48.

.

.

.

Angulus defenfus

contme~

20

gradus fupra dt-

midium angulum polygorn.

.

Ala in IV. 1

i.

exapedas habet.

In

V. 14.

m

VI.

16.

in VII.

18.

in IX.

u,

in

~eliquis

14.

.Q!jinta methodáJ Hollandica.

H<Ec merhodus

a

przcedenti diícrepat tantum

penes angulum defenímn , cui pr¡¡:ter femilfem

anguli polygoni addi¡

15

gradus.

Method111 Goldmani.

Cortina

80

exapedatum.

Facies

40.

~lain

IV.

10.

in

V. 13 ..¡...

V!·

1¡.

VI!·

167.

VIII.

i8.

I X.20. X.L t

1 .

Xl.23 ¡.

XI I.

25.

Angulus defcnfus in quadrato

60. V.

69.

V f.

75.

V 11.

79·

Vlll. Sl

I X.

85. X. 87.

xr.

88.

XII.

90.

Ollilil!l'1l!lm!'1l!lil1llllllll!il!l8ll'IJ!1.eil!l:.il!l1ll.l!l'1l·1)'1¡1J1llli!Woo

P R O P O S I TI O

X X V.

De fi•ppmatione lincar11m

,

&

angulomm

ichnographicornm.

~1ia

diagrammata qu:r: in charca exarannir

minora funt, quarn ut linearum longicudincm

pr:r:cifam,

&

angulorum quanritatcm exaél:am

exhibeant, ira

ut

in iis proclive fü non canrum

aliquibus pedibus , fed eciam exapedis·aberr:ire ,

nonnulli diligentiores trigonometricc íingularum

partinm menforas inquirunt. Q!tia vero rrigono–

mica: praxes aliqua in triangulo cognita fupRo–

nunt,

m

cztcra i1weíl:igenr, fupponemus angufos

ccntri,

&

angules circumferentia: fupra cogniros.

'Anguli ccntri.

1

I

l.

IV. V.

V l.

VI

l.

V

1l

l.

I

X.

X. X

T.

X

1

I.

Anguli cir–

curnfere1nia:.

110

90

71.

60

JI +

, 4f

40

3~

p!-;

)O

60

90

108 110

u8.34

l;J

140

l4f 147,16

IJO

PROPOSITIO XXVI.

fing11/tlm defon/i<m

,

immin11t11m

,

deftnden1em

extern11m

&

intermem

,

&

a11gulum

hmneri reperire.

Angulus defeníus ídem non eíl: in omnibus me–

thodis.

fo

me1hodo Gallica angulus defenfus in

quadraro

60

gradus obrinet,

&

7

J

in penrngo–

no. Angulus defendens inrerior eíl:.

J

4

graduum,

& ;

mm. cum enim ala

lit

fexra pars !"aterís , cric

quarta pars cortina: , ut in figura, Gr OH rota

cortina,

l5c

CD ala, íi in triangulo HDC,HD po–

namr finus torns, erit OC rangens anguli HDC;

fiar igirur

ut

HD ad DC , hoc eíl:

ut

4

ad

i

,

ita

!inus rotus ad tangentem , inveniefque gradus

14.'

min.;. pro angulo defendenre inrerno DHC,

cu1 •ngulus imminurus HBC a:qualis eíl:, utpote

illi alternus.

In

ornni igitur munitione in qua ala quartam

panem cominet, tam angulus defendcns interior,

quam angulus imminutus

1

+

gradus

&

tria mien–

ta fibi vendicanr.

Siangulum imminutum l-IBK fobtrahas ex

íemi–

angulo,polygoni IBH,reíl:abit fcmiangulus dcfcn·

fus IBH :

e

contra

fi

cognofcas femiangulum dc–

fcnfum IBH,eumque fobtrahas ex íemiang

ulo po.

lygoni

IBK ,

reíl:abir angulus imminutus H.BK,

cuí angulus defendens interior a:qualis cíl:.

Duplica angulum.dcfcndentem internum DHC,

eamque fummam fubtrahe,ex

180,

reíl:abit angu–

lus defendeos exterior BOK ; nam in triangulo

GOH ,cmn omaes anguli duobus. reél:is íint a:qua–

les, feu

1

So gradibus , íubrralfo angulis zquali–

bus OGH , OHG, feu angulo OHG duplicare,

reíl:abit angulus GOH , aut ipíi oppoíiras

BOK.

Aclde an_gulum defendentem inrernum CHO ,

90

gradibus, habebifque angulum humeri BCD;nam

(

per

23.

J.

E11cl.)

angulus BCD, extcrnns reí–

pefü1 ¡rianguli DCH , d11obus internis

CDH,

CHD a:qualis

di:.

In munitionibus qua: habent defeníionem

fi–

gentem , facilc habernr angulus defendens inte–

rior, modo fciatur ratio ala: DC, ad lineam DH.

Denique angulus faciei,

&

íl:ringemis DCH,

eíl: complemenrum angnli defcndentis

intcrni

CHD.

OO!l!l001l'lilll.!~Oll1!'1!!ltl1\'l.!11!1lil'l!·1lliil'l!il'l!0iiil'll!lll1!li·1!1r

P R O P O S I T 1 O

X X V I

t.

[nvenire ang11l11m determinantem al.i , a11gulum

capitalú

&

cortin.t; ang¡¡/11m oppojitt1m faciei,

1

&

ang1d11m c11pi1ali oppojíttem.

Angulus dererminans alam CID,in meihodo Gal–

lica , qua: alam ada:quat femic_ollo

,

cíl: graduum

45

in