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Liber

VI.

9r

tur ; aífcro camen

ni.hi~

in hoc negocio contra

con1111uncs lcges adn1ttt1.

Ocmoníl:ratio. Q:_1odlibet potcíl: pro tabella ;

- ergo planum horizoncalis potcíl: planum tabella::,

fcu fel\ionisevadere: fed in hac hypothc!i ichuo–

graphia eadcm perícvcrat , urpotc cabclla:: paral–

Jet. ; ergo íccundum regulas univerfoles ichno–

grnphia 1mmutata pcrícverar.

1!1!!lli1ll11llllliJ:1!11lliJ:¡¡¡jl\lj!liiml1l"l!.1!11!l1l1!111!11!lli1!11lllJ!t!lli1i

P ROPO SITIO

'.XI.

Smmdum 'Pri11cipi11mperfpclliv.e militarú. Linu

vmica/es

fimt

parallel.e imer

fa

fuafqr«

dimenjionCI con{ervmn.

Perfpeél:iva comi:nunis Jubct in mbclla hori–

zomah, !mea: objcll:ivx vcnicales ita exhibcri

m

concurranc in punll:o principali, viciniorefque

oculo majores app?rerc, fed

(i

fnpponamr

ocul.i~s

in maxima dííl:antia

f

poffimt rcpra::fencari per

li–

neas parallelas. Poffi1mus ergo hanc Cequí rcgu–

lam urpote facillimam , qu:e quamvis in rigore

nonn1hil deliciat, objeétum camén' Íat bcne

rc–

prxíenqt.

!1.ll11j1'í1flfil!'®!tlll!ll1lllmJ!lüllJ6!11l!lll7l1i!.lílW'Jll1lil1lllli!l¡¡¡¡

P

R O P O S

I T I

O

XI

I.

M1tros verticales rnilibet plano g•ometrico in–

fiftemc1

e.~hibtre.

.Sit

lchno~raphia

Geometrica ABCDEF, qdte

etiam craíiic1cm mmi exhibendi prxfcrat, ducan–

mr ex

om~1bus

.•ngulis Ggurx tam interioris,

quam exter1ons !mea:: parallcl.z ,

&

a::quales ínter

fe,

quarum extrema lineis rell:is conjungantur

&

abíolma erit operatio.

'

Ha::c praxis fJcilc demoníl:rabitur

/i

íuppona–

Tom.

l

~l.

tur oculus

maxim~

dil\ans non quidem

a

tabella'

fod

a

fi~ura

dcrcnbend;,

linea:

ven1calcs concur–

~:~1ltecl~.m

punél:o valdc di!Iito erum phyl\cc pa-

Nocandum e!t plurimas

~incas

pcrfcé\:o opere

n_on comparece , eo quod •ntra muto1um c1affi.–

r1em cadam, am ab ca occuhemur.

!1.lll.!1l1Jilll!!W(l:¡ja:llffi'!·1!1!Gll:Q!l1!11lliJIJZH'fll.1!8!l!l~N\ll'l\1j¡!

P R O

P

O S

l

T 1

O

X

11 I.

Sripr.1 iclmographÍam Geomc1ricam 11111ros

ttccli·

ves excitare.

:~

0

-r ·

e

·Sup.pon

lanum Geometriculll cui

imponen~

dos fofcipimus muros acclives

effe

ABCD, fiique

fcél:io verricalis murorum EFGH. De(mbaturtir–

ca planum ABCD, planum accliviratis , quod ab

co d1!ler fccundum lineam GH. Excirenrnr exinde

(

rer

pr~cedenrem,)

nmri relb

fupra planum

.A

BCD, denique ex angulis plani íuperioris , du–

canrnr linea: rcéhc ad planum acclivicatis,hab¡bi–

rnrquc dc(criptio murornm aclivium.

ll1!:\ZDIZfl:OOmltíillil 1!1l1Jil1:ilil!l1ml001J'l!:l.lllW!Z21Jill1ll1Jil!ri!

PRO POS

l T l

O

X

1V.

V

111/um

,

&

loricam

c11m

fi1ú

1tcclivittt1thm

e.wi•

tare Jitpra

pla1111m

Gtomctr.irnm.

Suppono jam haberi planum Geomerricum

il–

lius munirionis,vc1bi gtaria reduéHls AIJ<;:D; lir–

quc FE

M

ícll:io vcnicalis, in qua de11111f.i: liur

perpendiculares

MI,

LO,

&

KH

ducarur in plan.o

linea pcrpcndicularis FE, in quam transferes di–

vifiones line:x: FE íeél:ionis horizontalis, per quas

ducamur parallela:

J

inca:

BC

ufque.ad

~iagon~lcm

B N.

Excitemur iccm in punlhs d1agonalis

13 N

linex verticales, a:quales

perp~.nd1~ulanbu.s

ícél:ionis verticalis. Wem

liar

in alns d1agonall–

bus, habebifque fiipra fü1gulas.

~otidem

fea.iones

M

IJ

vcmcales