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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 806933011:0764
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SPI
IE the Pole OF che Primitive Circt e legute
etiS IIS C CHEC.
a Diameter) curs ic.
ertich in che Projection will Bc an Ark OE a GFCAE
Circle.
2. Consider charchis Cirete Mu Cu eC LMi-
rive in evo POinES, char will be distane FrON
cach ocher just a Diamerer, 25 is che C ase oF th.
Incersection ot all grear Cireles.
2. The Pole ot ehis Circle must be in a Lit
Perpendicularto iis Plane. And,
2. Lay 2 Ruler trom A cO B, ic will cur che
Limb in F; chen rake che Cord of 90 Degrees,
and sec ic trom Fcoh.
3. Lay a Ruler From BEo A, ic will cuED P in
S: which Poines is che Pole required.
N. B. The Aindino che Poinrs sandB, is called
reducins B co che Primitive Circle, ard 10 rhe Di.
ameter.
EROP. XV.
Problem 4. T0 describe a Spherical Angle os any
Number os Dezrees siven.
P. TF the Angular Poine be acthe Center oF che
Primitive Circle, then rismade ac any Plain Angle,
numbrins che Deorees in che Limb, From che L ine
OF Cords: For all Circles passins chro che Centre,
and wrhich are ac Righe Angles wich che Limb,
must be projected into Riphe Lines.
2. TF che Angulas Point Be at the Periphery OF
the Primitive Circle; dram a Diameter aS AC 3
(sec the last Fipure:) Then cake the secanr oF che
Angle siren in vour compasses, (a5 suppole 65
Degrees) and Cetring one FOOF in A, crols che Di2-
meter in e, exifno Diamerer be drawn, placing one
Foor in C, and CrostInS THC FORMeF AEK, vou wvill
find che same Poine e, Wvtich is the Cencer ol rhe
Cirele A a C, ertrich wichche Primitive makes an
Ansle D A 2 OF65 DCgrceS.
N. B. H che Angle siven be obrule, rake che se-
cant oE its SupplemenE rO 180 DegrCeS.
3. IFa Poine as a vere aigned, chro Wrhichthe
Ark OEthe Circle constiturins che Ansle must pa(S;
deaw che Diameter A C (aS BCFOrC:) Tten cake
che secant ot che siren Ansle, and setrins one POOE
in A or C, Srike an Ark as ac e, andrhen wichche
secane ot the given Angle, Petring one Foorina,
cross che ocher Ark in e, Wrhich will berhe C entre
3. This Circles Pole cannor bur lie berveenthe OE che Oblique Circle required.
Centre oF che Primicire one, and ils own.
kDP. XIV
Problem 3. Z0 find the Pole of any Cireat
L.iClC.
IEthe Pole OL a Right Or Perpendicular Cirele b
Soughr, Tis 90 Dessces MMane, reckoned uxon che
Limb trom the Cors, Wontete  enet (irtrich.
AS P is Pole OEthe Perpendieular CirCt a B.
IF ihe Pole oF au Oblique lircle bc deser
Por lntance.
PROP. XVI.
Problem 5. Fo dram a great Cirele thro any eud
Poines siven, asa and b within the Primitive oe.
quired.
Leche Poles ol n dre
Dra a Diamerer thro thac Poinc which is fur-
hest From the Center, a5 D R, producins ic be-
rond che Limb if chere be occation; Pet 90 DC.
1. Draro che Diamerex A C, audl chem auorhiex erees rom D or R c0O, and drav O a.
as b F, Perpendiculas 10 i1.
Them