Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. -
Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German. Mean line confidence on this page: 0.89.
Original at the GWLB · Page image · Annotations (IIIF) · Download text
The machine reads it as
- 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
Cite
Lexicon Technicum: Or, An Universal English Dictionary Of Arts And Sciences, fol. - . Machine transcription, not an edition: Leibniz Legible (model FoNDUE-GD_v2_ft_Leibniz, run 74). https://leibnizlegible.com/page/806933011:0764?run=74