The Description, Nature and General Use, of the Sector and Plain-scale,: Briefly and Plainly Laid Down. : As Also a Short Account of the Uses of the Lines of Numbers, Artificial Sines and TangentsTho. Wright; and sold, 1721 - 44 páginas |
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Página 3
... Center , of a right Line drawn from the Center of the Circle parallel to the Tangent of the Arc , cut off by the Chord of the Complement of the Arc to 180 Degrees , as EH is the half Tangent of the Arc AB . But because ( from prop . 20 ...
... Center , of a right Line drawn from the Center of the Circle parallel to the Tangent of the Arc , cut off by the Chord of the Complement of the Arc to 180 Degrees , as EH is the half Tangent of the Arc AB . But because ( from prop . 20 ...
Página 5
... Center , and then you may transfer the Line of Sines to your Scale . " Again , to project the Line of Tangents , from the Center E , and thro ' every Divifion of the Arc BD , draw right Lines cutting BF , which will divide it into a ...
... Center , and then you may transfer the Line of Sines to your Scale . " Again , to project the Line of Tangents , from the Center E , and thro ' every Divifion of the Arc BD , draw right Lines cutting BF , which will divide it into a ...
Página 9
... Centers , and Poles , of projected Circles , in the Stereographical Pro- jection of the Sphere , & c . The Rhumbs , are to lay down the Angles of a Ship's Way in Navigation . And the Line of Longitude determines by Inspection , how many ...
... Centers , and Poles , of projected Circles , in the Stereographical Pro- jection of the Sphere , & c . The Rhumbs , are to lay down the Angles of a Ship's Way in Navigation . And the Line of Longitude determines by Inspection , how many ...
Página 10
... Center of the Joynt , contains Angles of different Magnitudes . The Length of thefe Legs are not determined , but yet they are generally about 6 Inches , having a proper Breadth and Thickness . This Inftrument takes its Name , from a ...
... Center of the Joynt , contains Angles of different Magnitudes . The Length of thefe Legs are not determined , but yet they are generally about 6 Inches , having a proper Breadth and Thickness . This Inftrument takes its Name , from a ...
Página 11
... Center , with 1 , 2 , 3 , & c . to 10. near which are placed the Letters LL . The three Pa- rallels , that be drawn , to each of these Lincs , are for the Eyes better diftingishing the Divi- fions , and Subdivifions , as alfo are those ...
... Center , with 1 , 2 , 3 , & c . to 10. near which are placed the Letters LL . The three Pa- rallels , that be drawn , to each of these Lincs , are for the Eyes better diftingishing the Divi- fions , and Subdivifions , as alfo are those ...
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The Description, Nature and General Use of the Sector and Plain-Scale ... EDMUND. STONE Sin vista previa disponible - 2018 |
Términos y frases comunes
30 Degrees 45 Degrees 90 Degrees alfo Angle ABC becauſe Cafe and Example Center Circle defcribe Defcription Degrees 30 Minutes Diameter divided Divifion equal Euclid Example of Prob Extend your Compaffes Extent will reach fame Extent fecond Line fet one Foot fides Firſt folve the Cafe fome fought Side fourth Proportional fought fubdivided fuppofe gent given Line grees horizontal Plan Hour Lines Hour Points Inch Interfection Joynt laft Chapter laftly Latitude leffer Tangents Legs Length likewife Line BC Line given Line of Numbers Lines of Chords Lines of Lines Lines of Polygons Lines of Secants Lines of Tangents meaſure muſt Number given number'd open the Sector parallel Diſtance propofed Quadrant Radius regular Polygon remaining thus opened right angled right Line drawn Sector fo Sector remaining Semitangents Sine of 90 take the parallel Tangent of 45 Tangent or Secant tetet ther theſe thofe thro Trigonometry uſed verfed Sine
Pasajes populares
Página 4 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.
Página 2 - The sine of an arc is a straight line drawn from one end of that arc, perpendicular to a diameter passing through the other end of the same arc. Thus FG is the sine of the arc BF, or it is the sine of the supplemental arc FAH¿>. The sine of an arc of 90° is equal to the radius, for AC is the sine of the, arc BA. The sine of an arc of 30° is equal to half the...
Página 9 - Infpe&ion, how many Miles there are in a Degree of Longitude, in each feveral Latitude: As, in the Latitude of no Degrees, that is, under the Equator, 60 Miles make a Degree ; in the Latitude of 40 Degrees...
Página 9 - The graduated line of chords is necessary, in order to show the latitudes ; the line of longitude shows the quantity of a degree on each parallel in sixtieth parts of an equatorial degree, that is, miles. The lines of tangents, semitangents and secants serve to find the centres and poles of projected circles in the stereographical projection of the sphere. The line of sines is principally used for the orthographic projection of the sphere. The lines of latitudes and hours are used conjointly, and...
Página 5 - AB; from eveiy of which Degrees let fall Perpendiculars on the Semidiameter EB, which Perpendiculars will divide EB into a Line of Sines, to which you muft fet the Numbers io, 20, &c.
Página 10 - Joint like a Carpenter's Rule ; fo that the faid Legs, together with certain right Lines, drawn from the Center of the jokit, contain Angles of different Quantities.
Página 5 - Quadrant AB, and they will divide the Semidiameter AE into a Line of Semitangents : But becaufe the Semitangents on Scales run to 160 Pegreesj continue out the Line AE, and draw L'". .: Lines fcihcs from the Point C, thro...
Página 8 - And contrarywife, to meafure the Quantity of an Angle already laid down. The firft is done by...
Página 6 - Arcs cutting the Chord AC, which will divide AC into a Line of whole Rhumbs ; and after the ^arne.
Página 32 - As the Sine of the Angle BAG is to the Sine of the Side BC, fo is the Sine of the Angle BCA to the Sine of the Side AB fought.