The Description, Nature and General Use, of the Sector and Plain-scale: Briefly and Painly [sic] Laid Down. As Also a Short Account of the Uses of the Lines of Numbers, Artificial Sines and TangentsT. Wright, 1746 - 44 من الصفحات |
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الصفحة 4
... Degrees , is infinite . The Circumference of every Circle is fuppofed to be divided into 360 equal Parts , called De ... 30 , & c . to 90 , to them ; each of which 9 Parts again fubdivide into 10 equal Parts , and then the Quadrant will be ...
... Degrees , is infinite . The Circumference of every Circle is fuppofed to be divided into 360 equal Parts , called De ... 30 , & c . to 90 , to them ; each of which 9 Parts again fubdivide into 10 equal Parts , and then the Quadrant will be ...
الصفحة 5
... 30 , & c . and the Line of Chords AB will be divided , and then may be put upon your Scale . Now to ' project the Sines , divide the Arc BD into 90 Degrees , as before you did AB ; from every of which Degrees let fall Perpendiculars on ...
... 30 , & c . and the Line of Chords AB will be divided , and then may be put upon your Scale . Now to ' project the Sines , divide the Arc BD into 90 Degrees , as before you did AB ; from every of which Degrees let fall Perpendiculars on ...
الصفحة 8
... Degrees of Chords between your Compaffes , and defcribing an Arc about the angular Point ; and then laying off the Nuinber of Degrees pro- pofed upon the faid Arc , and drawing a right ... 30 Degrees , the Quantity of the Angle fought ( 8 )
... Degrees of Chords between your Compaffes , and defcribing an Arc about the angular Point ; and then laying off the Nuinber of Degrees pro- pofed upon the faid Arc , and drawing a right ... 30 Degrees , the Quantity of the Angle fought ( 8 )
الصفحة 9
... 30 Degrees , the Quantity of the Angle fought . The Sines are to orthographically project the Sphere , & c . The ... Degrees , that is , un- der the Equator , 60 Miles make a Degree ; in . the Latitude of 40 Degrees , 40 Miles make a ...
... 30 Degrees , the Quantity of the Angle fought . The Sines are to orthographically project the Sphere , & c . The ... Degrees , that is , un- der the Equator , 60 Miles make a Degree ; in . the Latitude of 40 Degrees , 40 Miles make a ...
الصفحة 13
... Degrees . The Num- bers 10 , 20 , 30 , & c . to 75 , are set to them , and they are known by the Letters SS . Laftly , The Lines of Polygons are drawn from the Center of the Joint , very near the in- ward Edges , and number'd from 4 , 5 ...
... Degrees . The Num- bers 10 , 20 , 30 , & c . to 75 , are set to them , and they are known by the Letters SS . Laftly , The Lines of Polygons are drawn from the Center of the Joint , very near the in- ward Edges , and number'd from 4 , 5 ...
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عبارات ومصطلحات مألوفة
30 Degrees 45 Degrees 90 Degrees aforefaid alfo Angle ABC artificial Sines Bafe becauſe Cafe and Example Centefmes Center Circle defcribe Defcription Degrees 30 Minutes divided Divifions equal Euclid Example of Prob Extend your Compaffes Extent will reach fame Extent fecond Line fet one Foot firft Line firſt folve the Cafe fought Side fubdivided fuppofe gent given Line grees Horizontal Plan Hour Lines Inch Inftrument Interfection laft Chapter Laftly leffer Tangents Legs Length Line AC Line given Line of Numbers Lines of Chords Lines of Lines Lines of Polygons Lines of Secants Lines of Tangents meaſured muſt Number given number'd open the Sector paffes parallel Diſtance propofed Quadrant rallel regular Polygon remaining thus opened reprefenting right angled right Line drawn Sector fo Sector remaining Semidiameter ſet Sine of 20 Sine of 90 Sines and Tangents Tangent of 30 Thefe Lines Theſe Triangle Trigonometry uſed verfed Sine Whence
مقاطع مشهورة
الصفحة 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.
الصفحة 2 - A chord (BD) is a right line drawn from one end of an arc to another, and is the measure of the arc. The chord of an arc of 60 degrees is equal in length to the radius of the circle of which the arc is a part. 17. The segment of a circle is a part of a circle cut off by a chord.
الصفحة 3 - The SECANT of an arc is a right line drawn from the centre through one end of the arc to meet the tangent drawn from the other end ; thus CT is the secant of the arc AS.
الصفحة 2 - The sine, or, as it is sometimes called, the right sine, of an arc, is a right line drawn from one...
الصفحة 3 - K and PHQ are tangents. A tangent of a circle is at right angles to the diameter drawn through the point of contact. There may be tangents to other curve-lines as well as to circles.
الصفحة 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.
الصفحة 9 - Miles make a Degree ; in the Latitude of 60 Degrees, 30 Miles make a Degree ; in the Latitude of 80 Degrees, 10 Miles make a Degree.
الصفحة 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...
الصفحة 9 - Latitude : As, in the Latitude of no Degrees, that is, under the Equator, 60 Miles make a Degree ; in . the Latitude of 40 Degrees...