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Liber 111.

·

s21,

&

coníequeñter linea: BT, BS horizofttales orunt.

Cmn ergo linea:

v~rbi

gracia Cl_T,quz funt appa·

rentiz linearum horizontalium conveniant , in

punél:oT, linea: horizontalis

(per

14. 1.h11j1u)

crunc •ppatemi:i:

linearnm parallelarum linez

BT ; ergo ·linea: quarum

Q_

T, funt apparentiz,

comprehcndcnt cum lihca quacumque ad cabel·

bm reéH.,

&

coníequenter parallela linez AB,an–

gulum zqualem angulo CBD.

~are

Ít

fupra hu–

julinodi lineas paratlelepipeda excitenmr , eorum

latera przdiélum angulum, cum liueis ad rabel-,

lam rcél:is comprehendem.

.

Si igimr in punélo

Q_,

excites perpen.d1cula–

rem QR, cujufcumque alcimdinis. ltem m

pu~él:is O

&

H , duélis ex punéto R ad punéta acci·

dentalia T

&

S, lineis R T, R S, decerminabun–

mr c:1:cerz alcimdines.

Idem przllare poceris etiamfi pavimentum non

foericdivisG in

quadraca.Si

enim ex punél:o X,du–

cas lineas XT,

X

S,& ad dctenninandá craffitiem

muci, verbi gracia,íumatur linea XV, volunt non–

nulli duci lineam V T, qua: Íecet in punél:o S, li–

neam XS ; exillimantquc lineam X S ,

effe

app•·

rentiam linez zqualis ipli X V. Sed hoc e!l fal–

fum ,

ut

facis ollendam fuo loco, nl!i punélum T

lit

pcincipale, & punlh1m S, punélmn dUhntiz.

~13re

accipicnda erfcc SF, a:qualis linez SB, du–

cendaque linea XF, qnz daret lineam XS, zqua–

lem perípeélive lincz XV.Excitara perpendicula–

ri X

1,

ex punélo

1,

duccnd:i: Íunc linea:

1

T,

1S.

Si velis

longimdin~m

X 6 determinare, fuma–

tur linea X Y, a:qualis linea: cujus X 6, deber

elfo

•pparencia. Q!10d fi delineanda lic in medio fene–

fic.,

fint X

!,

Xi

,

zquales lineis quarnm app•·

rentia: dcbent

elfo ,

linea: X 7, & tune fumpta li–

nea TE, 'l,uz

lit

zqualis linea: TB, dnc lineas oc–

culcasYE, IE, ZE, íecances lincam XT, in pun–

ll:o 7, pee quod excicabis perpendicularem ; pro

decerminanda fencllra accipíacur intervallum 4

J

ad libirnm, ducancurque linea:

J

T, 4 T, íecames

pcrpendiculores , arque ita perfiGies fenellram,

Non aff'ero hic

r~cionem

cur fomcndz funr linea:

TE, SF, zquales lincis TD, SB, hoc demonlhabo

fuo loco.

.

l!ilil?:l!lllll'll

0

ll'll!lllll'i!.l!!lillliill·llllll'lll!!l.1lllll'lll!'1l~llfl!JA

P R O P O S l T 1O

X.

Problema.

I

am11u

&

fentjlrtU in

4dibus apre collocarr;

Faél:o pavimento pet fuperiorcm , teligarur

crallitjes muri AH, ducancur

d~

radii A K, H

K

tjuorum ulcimus

Ítt

invifibilis. Sic primo con·

,llruenda.porta in muro,AC. Sic linea AV, zqua•

,lis profunditati ad quam delincanda ell porta VX'

lit lariendo porcz, TD,XY,

Ítt

lacimdo poflitlm,

linea AP, !ir laticüdo porcz, ducancur

lin.ez

TJ1,

VF, Xf, VY ad punél:um dillanci:i: F,

&

m p

u.n–

él:is in quibus

a

diagonalibus illis

íecacu~ radi~s

A K, excirecur pcrpcndicularis A

P,

dullo radio

P

K ,

habcbicur alcicudo porra: , czrela per

fe

pa•

tent.

Eodem modo delineablmr fencflra,fi linea AE,

liac zqua(is difl:anciz feneflra: •.b extremiratc AB,

linea EM dimidia: feneftrz,

&

!mea MD, fit

altetl

dimidiz fenellra: zqt1alis,cum duél:is

diago~alibus

EF,MF,DFad punél:um. dilla.miz F, fecabHur ra•

dius ifl punél:is

G,N,O,in

qmbus cxc1tandz enrnt

V V

11

perrendicl.l