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# Title: Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences (shelfmarks Leibn. Marg. 71; ZEN Leibn. Marg. 71)
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thereto. Then che Linc C R L’beins divided in-
to equal Pares, ansiverins ro equal Spaces oF Time,
ter the Descents oF che Project be laid donn in Lines
parallet ro CC, proporrioned a5 the Squares oF the
the Times, (1. c.) lec them De araWon HNOMS
t0T, TrOm R LOV, From L FOX, and FrOm L EO B
and deaw che Lines I HI, VD, X Y, BC, P2
rallel t0GF; L Car, the Points T, V, Z, B, are
Points in che Curve described by che Project, and
that that Curve is a Parabola.
Thac che Poines are in the Curve, is eridene by
Axiom 2. Under che NVord Descent of Feavy B0.
dies; and ehe Parrs of the Descent GFI, CD, G Y.
GC== ST, RV, LX, FB, being as theSquares
OF eHe Times, (by Prop. 2. under the WVord DC.
Scent) chat is a5 the Square of the Ordinates FIT.
DV, YZ, BC = OS, GR, GL, GF, chc
Spaces mealured in those Times; and there being
no other Curve bur the Parabola, Whole Parts ot
the Diameter are 25 the Squares oF che Ordinates.
it Follons chat che Curve described by a Project can
be no other chan a Parabola: And Cayins, 25 R V
the Descent in any Time, rO R C Or VD che direct
Morion in the same Time; (0 is V Deo a Thira PFO.
Portional, or the Paramerer ol the Parabola 1o the
Diameter C C, Wrhich is alvars the lame in Pro-
jects cast wich the lame Velocity: And the Velocity
being detined by che Number oF Fcet moved in a
Second oF Time, the Paramerer will be found by di-
vidins che Square OF che Velocity by 16 Feet L Ich,
che Fall ot a Body in che same Time.
PHOTECTION, in Carmister, is purtins any
Circles Or Meridians, and also AZimuths,
becaule che Pote is in che Zenith.
And ro deseribe these Circles, find che Pointe
Macrer to De calcined or fulminated inco the Cruci- 15, 30, 45, 60, (9c. in che Lquinoctial, by seuins
ble Spoonsul br Spoontul. The precended Cactins che LTaIF Tansent of cheir Distance From v; and
Of che Porder oF che Philolophers Stone into a Cru- chen their Centres are found by serring their Co-
cible ot metted Meral, in order (as cher boas secans boch ways trom cheir Poines ol incersection
ther can do) co cransinure ic into 60ld or Silver, lWvith che Equator.
is called also Projection; and the Marter they caA
In, the Pouder os Prosection.
PROTECTIONos the Sphere in Plano, iS a erIIC
∞, Eo, and W, W, are the Dorchern and Sou-
cherri Propicks, Which are described by serring the
Geometrical Delineation oF che Circles oF the FTaIE Tangenc oF 23 DCS. 30 Min. From Y’eactu
Sphere, or any altigned Parrs oF chem, uxon the war: Then che Tansent ot ies Complement, viz.
Plane of Come one Circle; a5 on the Forizon, Ne-
ridian, F quator, Propick, _c. And this is cither Ste-
reographick, which luppoles the Eye to be but
90 Degrees distant from, and perpendicular to, che
Plane oF the Projection; Or Orthographick, When
the Fye is ac an Intinite Otance.
By WHaC NaLH BCCH CalghE in our Doctrine oF
Spherical Geometry, (sec that Word) ic will bc very
66DC9. 30 MIin. each var trom thence on the
Colure produced, sires their Centres. By chis MC-
thod alI Parallels ot Oeclinations may be draWn.
O vou miohehave set the Co-secant et che Pa-
rallet from the Centre oF the Primitive, which
vould have also found the lame Point For the Cen-
ere ot the Parallet, whose Radius is equal ro che
Tansent oF ies Distance trom its Pole, bY Cor. 1.
calie ro project che Sphere on any Plane. For etie and 2. oE Probl. 2. OF Spherick Geometry.
Analemma, sec that WV ord. And here FOlIOWS an
Fixample of the Scereographick Projection ot the
These Parallels in ehis Projection, are allo Mmi-
Sphiere on che Plane oF The Meridian, E. quinoctial, canters, or Parallels os Altitude.
and FTorizon, which gires sood Lighe into che
Knomledse oF Spherical Triansles, che Doctrine d
che sehere, Dralins, ec.
From che Dirision on che Scale ot Fals Tansents,
buc denominated accordins to the signs oF the Z0-
diack, rectionins 30 Deorees r0 each Sig.
On on the Planc os
Ihe S
PEF ZQN E DC che Meridian.
Z. arid s ea Lenbs 25 alo ete Lenab and
Nadir
F. O che F quinoctial and TTorizon.
ZI che equinoctial Colure and Prime et-
ticat Cirele–
 15N, Z 30N, Z 45NV, C9c. are TTour
2o. i. Iste ctrpirck. Wtien mun be dirideu
dornards by che Force ot Gravity. L et GB DC
the Corizontal Line, and C a Perpendicular
Ariom, under ehe Nord Descent, it vould more
equal Spaces in equal Fimes, ere it nor deRecteo
Lines GS, C RR, GL, G F, Or 25 che Squares o1