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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 806933011:0633
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PLAIET Scau, Ida chin Ruler, cither oF Nood
ox Brals, Whercon are graduaced the Lines ol
Chords, Sines, Tansents, Secants, Leagues, Rumbs, _
and is of ready use in most parE OF ihC Mathema-
ciekes, chiesy in Navicarion: A Description there
Ot sec undex the Word Scale.
PLAIN Table, is an Instrumene uled in Sur
revins oF Land.
1. The Table it selt is a Parallelooram 0
WVood, T4 Tnches and a halF lone, and FF In
ehes broad, Ox FhercabOULS.
2. A Frame oF Nood fixed ro ic, (025 a Sheer
OF Paper being laid on che Table, and the Frame
being Forced donn uxon ie, sgucezeth in all the
Edges, and makes ic lie tirm and eren, (0 25 a
Plot may De convenienely deavon upon ic. Vp.
on one lide ot this Frame Mould be equat Divi-
sions, for drawins Parallel Lines boch long wrise
and crols wise (as Occation mar require) Over
vour Paper; and on the ocher side che 360DC.
erees oF a Circle, projected from a Brass C enere
conrenienely placed in che Table.
3. R Box With a Necale and Card, 10 beAxec
vith evo Screws toche Table; verr usetul FOr
placins ehe Instrumene in che lame Posirion up.
On cvery Remore
Plane roux Table (Arced Wwich ehe Sheer upon
ic) as nigh co che Angle as rou catr, the NTorrI
end oF che Necale harigins directly over che
Flomer-de luce; thien make a MarK. upon thC
Sheet OF Paper ac ans convenient place For the
ansle A, and lar che end oF the Index co che
Mark, curning it aboue eill chroush ehe SighES
Tou espr B; chen dear che Line AB by che
Edee ot che index. Doche same For the Line
A C, Kecpins che Index upon rhe Ars MarK:
Then will rou hare upon vour Table an Anele
equal to che Angle in ihe Pield.
When rou have more Angles ro take, the
Hechod is chie same.
The Distances Trom the Angles co the InAtrU:
menc are meatured by the Chain, and set OH on
the Table wrich à Scale and Compasses
Wrhence ris (0 easie r0 rake the PIOE OF 2
Field ac one scation, by che Plain Table, EHIZE
There needsno other Direction Sec Surverins.
PLATNTIFE, is he chat sues or complains in
an AMIle, Or in an Action Personal; 25 in an
Action oF Debe, Trespass, Disecit, Derinue, and
che likeo
PLANCERE, in Archiecture, is che Vnder
Part OF the ROOF oF the Corona; Wtich is cHe
Superior part ot che Cornice, between vo Cy
matiums. Sec those Words.
PLANE os a Dyal, is the Surtace on wtick
4. A Threclerged Stas 0 supporr it, the Flead any Dyal is supposed eo be described. See 2
beins made (0 as ro sll the Socket ot ehe Table,
vet lo as che Fable may be casily turned rounc
ipon ic, Wvhen ris nor fixed by che Screw.
5. An Inaex, Wtich is a larsc Ruler oF WN00d,
Or Brals) al ise seal 16 Tnches lone, and tre
Inches broad, and (o chick as to makre it ArOng
perfectly of the Pame Distance From the Fiduciat
Fdee. Opon chis Index ris ulual ro hare mane
General ACCOnNE OF aII Such Planes under eic
Nord Oyalline.
PLAHIE Forizontal, in Perspective, is à Plane
Which is parallel to che Florizon, and which pas
les chro ihe EyC; or hach che ere suppoled 10
De placed in IE.
PLAHE os Gravitation or Gravity, in any
hearr Body, is a Plane supposed eo palo chro thie
Centre oF Gravier oF ir
PLANE, in Forrificarion, is the Reprelenta
tion oF WVorke in its Fleighe and Breadeti.
PLAHE of the Noropter, in OprickS, is FHaE
wrhich passerh chro che PToropter, and is perpen-
dicular eo the Plane of the rvo Optical AxOS.
PLANE Number, is thac wohich may be pro.
duced by che Mulciplicacion ot ervo Numbers
one into anocher; thus, 6 is a Plane Number,
because ic may be produced by the Multiplica
tion oF 3 bY 2; For tvice 3 makes 6. 50 al(0
25 is a elane Number, arising from 5 being mul-
ciplied by 3; and 9 is a Plane Number, produ-
ced by che Mulciplication oF 3 bY 3
PLANE Problem, in Machematicks, is suct
an one as cannor be Colred Geometricallr, bur
by che Incersection citcher oF a Righe Line and 
Circle; ot of the Circumterences OF EvO Cir
cles: AS, FTaving the greatest Side siven, and the
Sum of the otset Lvo, os a Riche-ansled Trian
ole; to findt the Triancle, to deseride d Trapezium
that sal mate a iven Area of lour iven Lines
And such a Problem can hare bur rno Solutions
because d Kighe Line can Cur a Circle, or one
Circle aHOEHEF, BuL HIO LOLIIIS. CZanaM.
PLANE Ceometrical, in Perspectire, is:
Plain surtace, parallet ro the Horizon, placea
lovet chan che Fyes Wnclem che visible Objects
ate imagined wichoue ans Alleration, excepE
xhac chey are lomerimes reduced from a preatet
PL ANI
202 leAex SiZC.
and Airm; havins a Roaped Fdge, called rhe Fi-
duciat Fdse, and two Sighes oF one HIciphe,
Whereot ehic one hach a Stir abore, and d
Thread below; and the ocher a Thread abore.
and a S Delon) 10 sel i ee HMCL, ds WBC
Seales oE equal Parrs, as also Diasonals, an
LneS OF Chordso
Lo tale the duantiry os an Ansle by che
Plain Table.
AS suppole A B and A C vere rvo Flede
oe Fences ot a Field, and ix Wele tesue
catie che anste A.