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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
# Folio - , page id 806933011:0899
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ic vere a Conrex-sla(s, in che Fioie OF a dark I that part oF irs Fund which is lorvermost, or niot-
Chavibes i l n K, and chac defis che distinet Bale est che Center oF che Farth, perceires TMat ParE OE
Ot chis Clal5.
Whatis here Paid oF the Poine b, and iES Repre.
sentation ac e, may be undetstood oF all the ortier
Poines in the Obicet, 25 oF a and e, and cheir RC.
prelentations ac f and d. For accordins tO
NII. NemtonS Belt Lyporhelis OF LigHE, C2CH Ra
hach irs Innare Colour and 1o will reprelent il
nohiece ic fallo.
2. A5 in a darte Chamber chat has a Ltole Currii
Med Wich a Conrex-glals, if che Paper thac isto re
SIe, Chatine LSC IM Ihe FOIES, SecereS AN IM
Pulse or Scroke by che Prorrution Lorralus  ele
Luminous Axis a of, trom che Poine ot the Ob.
ject a; must nor che visire Faculty be necellarilz
directed hereby ro consider this Scroke, as comine
tromthe TOD a, Pathet CMaH trOm the BOttOII I, alte
ceirethe Imase inche distinet Base, De cirher nigher Nan Standins on his Hlead: l’or here, cho che
co, or Farcher from che Cla(s, than irs due distance, uxper Parrs ot Objects are painted on the upper
che Peprelentation chereon is contuled: For rhen parts ot the Frc, vet che Objects are judsed to be
che Radious Peneils do nor exaetly determine wirh Erect. And fromthis Posture of a Mtan, theRea-
their Apices on the Paper; buc chose from onc son appears, why we have uled che Words farthest
Point are mixe and contuled wich chole From the from, and nighest to the Centre of the F arth, xatter
adjaCeHE POInLS: S0 in the C alc OF Plain Vision, ris
than upper aud lover. For in ehis Posture, because
requisire chat the Pencils Mould exactlr determine che upper Parrs ol the Objects are painced on chat
theix Apices at def, on chie Rerina, Or else Vision parr oF che Fye nishest che Farch, (cho really che
is nor distinct.
it Mould hare a Pouer ot adaprins ic selt in lome
Nhac 25 Lala oE erect alu Rcoeise, idas dec
meature to nighr and distant Objects, For ther re- dersood ot sinister and Dexter.
quire ditterent Conformation ot the tive, becaule
the Rars proccedins From che Luminous Poinrs ot
nioh Objects, do more direrge thian those From
more remore Objects: Bur Whether this Variers
ot Contormarion consilts in che Crystaliines ap-
proachins nisher ro, or removins Farcher From che
Retina: Or in the Crystallines assuming a disterent
Convexier, lometimes greater, Lometimes lelS, ac
cordins a5 is requisire, is lelr to che Scrutiny ot 0
thers; and particularty che Curious Anacomicts.
This only may be Paid, Thar cither oF chese NC
thods, will serre co explain che rarious Phaenomena
of the Fyc: And thac boch chele maz actend cact
Ocher, viz. a lels Conrex-Crystalline requires an
Flonsation of the Fye, and a more Convex-C ry.
Palline requires a Morrnins thereot; a5 a more RaL
Conrex Object-slals, Or ot a larger Sphere, re-
quires a longer Tube; and onc Protuberant, buls
ins, or ot a smaller sphiere, reguires a Mortex
Fube.
gecher, on the Pusil in s h, (0 charthe lire is pla-
ced inche Point oF the srearest Contusion: BuE by
means of the Flumours and Coats thereot, cach
Conc ot Rays is Separated, and broughe by ic selt
toderermine  ses propes font on the Rerina, chere
paintins distinctr the Virid Reprelentation Or ie
Object, whieh Represemrarion is chere perceirea
crodins u ide Pole o ot he Crritalline, o
Cla(5.
vins rhe Reprelemrariom ot a paIE oOt an Obj eet On
ced on the Fund ot the lire inverted, and yet che
Sensitire laculer judging che Object Lrect, IC Fol-
Iows, Thac when the Image oF an Frect Object io
Painced on thefund ot the liye Lirect, che sene
judges char Object robe Inverted.
Luus, Che Lenocm or the Objeet ac, 15 Cllimracea
by che Anole a0c, f0 d, and chis is called che
Optick Ansle.
instead ot rhe CitalS ac d (F15. 2.) and a bc, Or ef 8
vere Objects, the Eye would perceire chem ot e.
qual bixness.
the Object as uppermoll, or tarthelttrom the C en
ere oF the Farrh: In ansiver to this, let us ima
consequers suoia De anccteu 10 conclude sche
Representation oCthe FOp =
Theretore ve may be latissteu os suponnz à
upper Lart ot the Lyc) thes ale Jucged ro be tar-
hest remored trom che Parth.
Theretore Lrature has loconcrir aHe LGC, Lhat
3. D) We Former Figure e perccive he Rays
From each Poine oF the Object, are all contuted to-
Os dle densitive doul
4. Weare likervise ro obserre, Thaxthe R exre
sentation ot ulse Obsect abc, on thie Fund ot che
Eye sea receu. tor (0 likewile ir i on the
Paper in2 Dark Room; there beins no orher Waz
Let CC Radions COnes 1O enter M YC, Or che
dark Chamber, buc by cheir AXIS a0, b o, c0
But hou il comes t0 p2IS, thar che Fye recei
5. The Imase of an Frect Object beins represen-
6. The Magnitude ot an Object, is estimared
Os ceAnole ihe Obicce Tubrenas betoce lae ese
WVhence ic Follows, char it the Fire ivere placec