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 Seiten |
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Seite 33
... Middle of the Line , with AB another right Line , which may ferve for the Meridian and Hour Line of 12 ; then take out 15 Degrees from your Tangents , and lay them off in the Equator on both Sides from 12 ; one of which Points will ...
... Middle of the Line , with AB another right Line , which may ferve for the Meridian and Hour Line of 12 ; then take out 15 Degrees from your Tangents , and lay them off in the Equator on both Sides from 12 ; one of which Points will ...
Seite 36
... Middle to 2 , are again fubdivided into 5 Parts . But the 10th from the second 2 to 5 , are only fubdivided into two Parts . Note , Each 10th fhould have been fubdivided into 10 other Parts , called Centefmes , but that the Length of ...
... Middle to 2 , are again fubdivided into 5 Parts . But the 10th from the second 2 to 5 , are only fubdivided into two Parts . Note , Each 10th fhould have been fubdivided into 10 other Parts , called Centefmes , but that the Length of ...
Seite 37
... Middle for the firft Fi- gure ; then the next Figure being 2 , count the Tenths from that 1 , and there will be the Point representing 12 . Again ; To find the Point reprefenting 144 . First , as before , take for 1 , the first Figure ...
... Middle for the firft Fi- gure ; then the next Figure being 2 , count the Tenths from that 1 , and there will be the Point representing 12 . Again ; To find the Point reprefenting 144 . First , as before , take for 1 , the first Figure ...
Seite 39
... middle Point between them will be 16 , the mean Proportional fought , For as 8 is to 16 , fo is 16 to 32 . PRO B. VI . To find the Square Root of a given Number . The Square Root of any Number is always a F 2 mean I mean Proportional ...
... middle Point between them will be 16 , the mean Proportional fought , For as 8 is to 16 , fo is 16 to 32 . PRO B. VI . To find the Square Root of a given Number . The Square Root of any Number is always a F 2 mean I mean Proportional ...
Seite 40
... Middle , in the fecond Part of the Line . But if the Number be odd , then the middle Unit will be most convenient , and both Root and Square will be found from thenceforwards towards 10 . SECTION II . Of the conjoint Ufe of the Lines of ...
... Middle , in the fecond Part of the Line . But if the Number be odd , then the middle Unit will be most convenient , and both Root and Square will be found from thenceforwards towards 10 . SECTION II . Of the conjoint Ufe of the Lines of ...
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The Description, Nature and General Use of the Sector and Plain-Scale ... EDMUND. STONE Keine Leseprobe verfügbar - 2018 |
Häufige Begriffe und Wortgruppen
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
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Seite 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.
Seite 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.
Seite 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.
Seite 2 - The sine, or, as it is sometimes called, the right sine, of an arc, is a right line drawn from one...
Seite 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.
Seite 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.
Seite 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.
Seite 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...
Seite 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...