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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 806933011:0665
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be Scercopraphick Projection on ibe Plane os
e E. quinoctial.
4. Clreles os albirude, ot Amicanters, are letet
Circles, Wwhole Poles are not in the Plane OF thCPrO.
jection, and may be described b) du Phird Casc
ot Probl. 9. OF Sphericke Gebstaty. Lhus che Cir
dle Oe is 2 Parallet os Labrude, 50 Dexrees abore
ehe LTorizon.
5. AII Four-Circles are Rrair LitK
ere roche Limb.
The Scereopraphick Project M the Llane o
ihe TTorizon
ihe Cen
Cex S C be che Meridian and Solsiriat Coture
F NV che Equinoctial Colure ard Lt
F
6.
P Ie North Pole
e5 e the Northern Propick.
es FV ehe Northern TTals of the Ecliprick,
Whole Cenere is found by sertins of
the Secant OF 23 DCg. 30Min. FrOm )
And ies Pole is at a the Incerlection ot
the Polar Circle and Meridian; and 15
che Place chroueh wtich all CMCt
Longirude must pals.
E. L. A ehe Horizon oF London, which is
delcribed thus: Serthe FTali Tangent of
ehre Co. latitude From P1OZ; then che
Fansent oC che Came, set From P 10O.
Ox irs Secant trom Z. 10O, sires is C en
tre; aud its Pole ill bc at B, 38 DC8.
30Min. (inthe TTals Tansents) distane
Uou E, Wohere b is ac chC Zenith.
T0 dr ad an ocher Circles in chis Projection.
First, Deau a Circle reprelemrine che HoriZon;
ot the Des rees ot their Distances from the Meri
dian, S P C, (ovtich is chac belonsins 10 18ODCB.)
2. AII Parallels of Declination are dravn by ser-
rins che Hals Tangents oE cheir Distances trom P.
3. l III Azimuths, OF Vertieat Circles, must pats
chro B ac che Zenith: Since theretore che Zenith
15 35; DC5. 30 NIHI. MILCAIM HIOHL L, ICL M Co-
Secax st OF that (Ox the SCCAnE OF SF De8. 30NVin.)
na quarter ic ih no BaIeTCIS.
Then Will
Z berhe Zenith OE che Place.
T2 Z +2 the Meridian.
6Z6 che Prime Verrical, Or AZimush ot F. _ H.
ZP = = TansenE OC 38 301 fOr TaneenE O
190 151
P Mall DC The Pole os che Worta.
Mate
ZE = = TanBEM OE 5F 30 (Or FanB CHE OF
25045)
A. 0 = SecanE
20 = FanS. fOE 38 De5. 30 Min.
Then Mall
obe che Centre os dhe Equinoctial, 6 R 6.
In chis Projection, almicanters ase all pavallet 10
Fren 2 h on ehe Meridian excended belowr, and chac the Primitire Circle.
Mal il Fird the Poinr x, the Cenere oF che Azimuth
Make
And
And Azimuchs are all Righe Lines, passins chro
OF Fast and Wes, viz. F hN; and che Cenres (2) che Cerre oE che Primitire, r0 che equal Di
oc all che rest are in a Line char s perpendicular 10) vilions in chie Libib.
h. Meridian, and deavn chroush N.
Paralels
T. For Cireles of Consituae, WICA MHUL ait paIS
hiro a and che sereral Degrees t  a
sit rheretore the Fangent ot 66DC8. 3b. trom
a dornrards, ot lhe Meridian produced; wrhich
iil sind a Poine, Chrovoh wvtich a l’expendicular
dravon tortie: Meridian, Mall contain in it the C en
eres oF all ihre Circles ot Longitude, whose Distan
ces Tet OFF 110 rhe Radius P X, Mall De the Tansents