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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 806933011:0814
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ROOES (VIZ. OF the upper) reach aS Fax a5 the PyCS
Or chacthe Came Nerrethatmoves chat FyC, sendi
aTvis cochese Tccth; neicher ot which conceir
are crue: The Roors of chele are single, as thol
Ot the Incisores, bur cher are boch Comerimes crook.
ed; andit such People in whom chey are l0, chanc
ro hare one ot them drann, cher can hardly be
pulled out, wichour breakins offa Piece oFrhe AI
veolus, in Wtrich cheyare fix d.
Those oF che Third Rank, are called Molares
Crinders, because like Mil. sones, chey Orind che
Meat. Mos commonly cher are cvener in Num
ber, sive in cach side of boch sans. Therwotore
most chac stand next ro ihe Dog. tceh, are less
chan che rest, havins bur cmo Knobs atthe lop
buc che chree Findmost are larger, andhare four
beins in a Manner tour Square.
The euo Foremolt allo, have bur rvo ROOrS 
most; buc che chrec hindmost, commonly, chrec, o
Tour. Buc thole oErhe uxper saw, have For che
most PAPE, One ROOE more, then chese which are
oppolice rochem in the Cover; or howerercheis
ROOrS are larger.
The Kcacon whereot masb,
First, Becanse chey are Pendulous, and s0 are
the apFer tO drop ouE: And
Seconc), Because the Subitanee et tne upPC
Pa, is noc (0 tirm, as chat oFche louer.
The Ce bt The Lcech, is prulepals 10 eten
the NCaL, LO prepare ic For thc Scomach, chat il
max che caser concoet ic into Chyle. Theinciso
res bice oEche Morsel, che Dos ccech break id
and che Crinders make ic small; Wheretore, chey
are Aac in che Top, charctier ma cheberter re
ceire, and keep che Meac; and rouxt, chac chey
mas grind ic che better. The Pecch concribure
also, 10 che Formarion ot che Speech, especially
che Foreceech; for chole chac hare lost chem
Lisp, as we Car, and cannor pronounce plainty, suet
Syllables as hare C, X, (96
TEINT, is a French Term in Paincine. sienisi
ins chac Arrificial Colour, ol nhich ans Objecti
compoled.
TELFPTHOM is che tame DIcer vich Chironis
(Wwhich sec;) ir is (0 called From one Telephius
ho as a lons cime rroubled wich chis Pileale.
Blanchard.
TELESCOPE, is an Opricte tnarument wohiet
Terres to discorer Objects ac a distance.
IF a Telescope consist only ot a Conrex Object
slass, and an Fre glass ot a much greater Con-
rexier, (or Wwhich is a Porrion oF a much lesser
Sphere) chan che Object stals is, (Wwhich 18 che
common Form of a Telelcope For ihe Nighr.
Then ill ch. apparent Magnicude oF rhc Object
(een chroush ir, be 1o che Object scen by the na
hed Fyc ac the Scarion, oF ihe Object. SlalS:: A5
the. Focal Lengrh ot the Object glals, 10 the Focal
Penerh oF che Fyc stals. Molineux Diopt. Nov.
Prop. L. XII. Thus
Suppose che Focal L ength oF rhe Object slals be
12 LOOl, Or 144 Inches, and chac of the fiye- gla(s
3 Inches; chen che apparene Diamerer ot theOb-
AIIO, if cuo Telescopes hare diserent L engths
and che Focus of the Fre slals oFche Shorrer, Deir
the lame proportion ro the Focus ot its Object
Slals:: a5 The Focus oFthe Pre. glass oF the Lonse
bears ro ies Object glals; chen thole rmo Tele
scopes ill Magnifie alike
Bur ver lons Pelelcopes are ot very great use
and eis impossible io mâke MOre ories perform as
Wvell: FOr,
1. Object. glases OF a ThOTTeF FOCUS, will nOK
bear Eyc. elals proporrionably MOrr, ictiout co
tourins he Object, or rendrins it dask and ob.
Ceure.
For Instance: Suppose a very 500d 12 F00r OB.
ject glass will receire an Lye elals ot no Morrer
Focus chan 3 Tnches, wich clearnels and distinct.
nels; vet horverer an Object-glals OF 24 FOOE
equalli so0d, will bear an ere slals of lels chan
6Inches Pocus (perhaps oE 5 Or 4 Inches Focus)
wich equal clearnels and distinctnels.
Andthen, tho an Object slalS OF 12 For, wict
an Eve olals ot 3 Ineties, ill magnitie buE AE
cimes, as is abore proved; vet an Object. elals ot
24 Foor, ich an Lyc. glals oF 4 Inches, willmag.
nihC 72 cimes; wrticti is near ore cuird more chan
chetormer; and chis is + vast AdranaBe.
2. The Imase oF the Moon, or orter Obiect.
in the distinet Base ot an Object sla(s oF 24 FO0r
is crvice as lons as che lmase in che distinct Bale 0
an Object glass of +2 FOOr: And consequentirche
Imaxe in cheformiex will be much more plain and
distinct.
Hence may be concluded also, That it che Ob.
ject. BlaIS, be formed on a lels Sphere than thC
Ere Bla(s, the Apueararice ot Objects will be
diministed in che atorelaid Proporrion; 25 is plain
by che Case, wrhen a Felescope is inverred
Theresore all Persons which relate Phenomena,
obserred by cicter Telescopes, or Microlcopes
ougtie eo menrion noc only the Lenoth oF che Tube
in genetal, bur also eo exprels theparricular FOcuS
oFboch Eyc- Blals, and Objcet- slats, rogether wich
the Aperture oF che Object. sta(S; Or el(C OnE CAHHOE
Wvell judse ofche Dcgree ot magnitvins
To decermine che Angle receired by à Telescope
ot chiis Form, ME. Molyneux sires chis Rule.
ASche Distanice Berween Object and Eye stalS,
is co haleche Breadch oF he Fre Pla(S:: Radius.
coche Tansenr of che Ansle.
IE2 Felescope consist oF a Conver Object Xlats.
and 3 Conrex Fiye-Blasses, Cirtrich is che utual
Forn ot Telescopes ro be uled by Day:) Them
ihc Distance berwween che Arst Lye. Blals and che se
cond, must berhe sum ot cheir Fori; cheDistance
beceenche second and chird Liye-slases, mustbe
allorhe sum oftheir Foci; Torhatallche Glassesare
distant trom rhe next adjacent Glasses the sum ot
cheir Foci; only indeed chere may be some licrle
Varicy in the Distance becween che Arst and se-
naked Lire, Wt be 25:: 144103, or ad 40le cond Ere elass; Wtrich is the reason chere is a
Dram avvars made chere, 10 alter it ac plea-
Pure.
This Telelcope is onty a double one oF che For
Iller Form, ard as the former Inverrs che Objects
this Inverrs char Inversion, by che addition of tvo
ore Classes, and consequeneir represent all chins
ject (een chrough che Gla(s, 20 chac seen by che
Wheretore tuch a Telescope ill be Paid comagni-
se che Diatmerer OF The Object 48 rimes, and itS
Surtace 2344 rimes, (2. e. the Sguare OF 28.)
Wnecctocei Chc lanre osectElato dC Coo
ned vith an Eixe Gla(s, Whose Focus is 1: and aF
anocher eime wich an Eye slals Wtole Pocus is 2.
uetorne releicope it maeuite cnre ad muct) libusi, di pactes aher aogeni sis cet.
e le lalet.
Leetepoto