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Catoptric~

ipli apparcant ereéb:. Sir cnim objelh1m G H,

quia angulus GO K , minar

e!l:

angulo H O K,

fienr ex alia parce anguli a:qualcs, crir MOL, mi–

nar quam N O

L

,

angulus rcflcxionis puoél:i G ;

igifur punélum G,im•gincm habebit in M,& H in

N ; quarc fpcél:aror qui cas im•gines inrucrur ex

punélo F , cas \'idcr crcél;as , quod onendcndum

cra~oneo

ramen capi\.m ira componi dcbcre m

fpcculum A B non onmino paceac ; fed canrum

ab aliquibus objeél:is radios excipiac ; •lioquln

nimium lumen,

&

inutile, immo noxiuro in cap.

Pc::::::JR

íam illabecur. Speculum ergo rurricula inclu-

dcndum en, debécque ad !.!>hum porfemagis, ailt

minus inclinad ad horizonmn , prour objeélo–

rum difpofüio cxiger

1

deber i1cm ad latera capím

Ut in p R , erre fcncnclla oblonga'

lit

pcr eam in

fob¡eéto horizoncali plano exprerfa:

imagines

fpeélari poffinr , ad dclineandaaucemobjcél:aap–

ciffimum en inl\rumcntum,

fi

arfcrculus ST, ele–

vari poffir ad modum operculi. Si enimcoum

capfam pallio involvas, excepta fcncnclla, qua

Ípcculum pacer,

&

fub eo pallio ahquis lacear po–

reric facile in horizontali plano capfa:,rcrnm

ima~

gines delineare.

Hoc arcificium pariccr cubiculo accommo–

dari porcrir , pra:cipuc /i in 1urris fanigio /ir

collocamm : mnc amcm lens virrca non omni–

no horizoncalircr diíponenda en ; íed angulum

aliqucm ve1bi gracia quindecim , aut viginci

graduum cum horizonte comprehendac, fpecu–

lum aucem qu•ntum fieri poien foris Ípeller,

tabella imagines excipiens /ir eundem curo ho·

rizonce angulum comprchendens , qucm lcns

vitre•.

Si vero cubiculum effec fuperius, ira

t1t

ob–

jeél:a qua: communirer vidend,a objicerenrnr,

crfcnt inferiou cubículo;

(anus

e!fcr lcorem ver–

ricalem diíponcre ,

&

Ípeculum ad •ngulum

gr~

duum quadraginra quinquc, ícd ad parces inferio–

res obverfum; c:1:tera ufus docebir.

CATOPTRICJE

LIBE R

SE C V N D V S.

De Speculis convexis.

"l C 11gcm1t1 primo de fpcmlú fpluricú con'llcxÜ, cxindt de cofamn11rib1t1 ,fa11 cylin–

~

dricü co11vexif, 11/tim'o de comw. Sph.trica r¡11idem ideo primo loco

explicamu~,

r¡111a

j1mpl1ciafimt,

&

non compojit11, cylrndric11 emm,

&

conic11, compojitaJimt; conjlán1tp1e

CllYVÍ,

&

reCIJ Ji1perfci;, hoc

ifl

Ji

{emnd1)m longit11d11mn fpeDtnt11r, proprietaw planomm admit–

t11nt,

Ji

fec1111d11m airvitatem, ad fplurzra dejleD11nt.

SVPPOSITIO'.

S

UPPos1no prima ÍUperioris]ibri, huic ma-

1eria: fuo modo apranda en' nempe radios

Íll·

ciden1io:,

&

reflc~ionis,

in cadem erfe ÍUpcrficic,

qua:

!ic

ad

Cupe•

ficie1n ípcculi reé\a. Sit cnim

~a¡lm$