Elements of Trigonometry, Plane and Spherical: With the Principles of Perspective, and Projection of the Sphere. By John WrightA. Murray & J. Cochran. Sold by A. Kincaid & W. Creech, W. Gray, and J. Bell; by D. Baxter, Glasgow, 1772 - Perspective - 251 pages |
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Page v
... circle to be divided into 120 equal parts , and by finding , in parts of the diameter , the chord of each degree and 60th part of a degree of the whole femicircle , or 180 degrees : each of the 120 parts of the diameter is fuppofed to ...
... circle to be divided into 120 equal parts , and by finding , in parts of the diameter , the chord of each degree and 60th part of a degree of the whole femicircle , or 180 degrees : each of the 120 parts of the diameter is fuppofed to ...
Page vii
... circle instead of the diameter ; but continued to divide it into 60th parts as before : they made use of half the chord , which is now called the fine , instead of the chord itself , and found it in parts of the radius ; and they re ...
... circle instead of the diameter ; but continued to divide it into 60th parts as before : they made use of half the chord , which is now called the fine , instead of the chord itself , and found it in parts of the radius ; and they re ...
Page xi
... circles of a sphere upon a plane and because pro- jection of the fphere is but a particular cafe of perspective , I found it of great advantage to make the learner first acquainted with perspective , next with the projection of the ...
... circles of a sphere upon a plane and because pro- jection of the fphere is but a particular cafe of perspective , I found it of great advantage to make the learner first acquainted with perspective , next with the projection of the ...
Page xiii
... circles to two equal arcs of two equal greater circles : the figure made up of thefe four arcs is faid to be an ellipfis . It is unne- ceffary to fhow , that fuch a figure cannot be an ellipfis , and that no part of an ellipfis is ...
... circles to two equal arcs of two equal greater circles : the figure made up of thefe four arcs is faid to be an ellipfis . It is unne- ceffary to fhow , that fuch a figure cannot be an ellipfis , and that no part of an ellipfis is ...
Page xv
... circle in the geometrical plane is made up of two femi - ellipfes upon the fame greater axis , but having unequal leffer axes . I have not added the demonftration of this : The read- er may confult the 28th and 29th of Sere- nus , De ...
... circle in the geometrical plane is made up of two femi - ellipfes upon the fame greater axis , but having unequal leffer axes . I have not added the demonftration of this : The read- er may confult the 28th and 29th of Sere- nus , De ...
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Elements of Trigonometry, Plane and Spherical: With the Principles of ... John Wright (mathematician ) No preview available - 2020 |
Common terms and phrases
ABCD adjacent alfo angle ABC angle ACB angle BAC angle BCA angle contained arithmetical mean bafe baſe becauſe centre circumference cofine cofine of BA complement conftructed contained by radius defcribed diameter divifions Extend the compaffes fame fecant fecond fect feries fhadow fhall reach fide AC firſt fourth proportional fquare ftraight lines fubtract geometrical mean geometrical plane given Hence hypothenufe join leffer circle likewife line of numbers lines of fines lines of tangents loga marked tan meaſure meeting number of degrees oblique-angled oppofite parallel diſtance perfpective plane perpendicular perſpective plane triangles pole PROP proper fraction propofition Q. E. D. Cor quadrant rectangle contained right angles right-angled ſpherical triangle rithm ſcale ſector ſhall ſpace ſphere ſpherical angle ſquare tangent of half terreftrial line thefe THEOR theſe three terms triangle ABC trigonometry wherefore whofe whoſe
Popular passages
Page 81 - Proportion by the line of lines. Make the lateral distance of the second term the parallel distance of the first term ; the parallel distance of the third term is the fourth proportional. Example. To find a fourth proportional to 8, 4, and 6, take the lateral distance of 4, and make it the parallel distance of 8 ; then the parallel distance of 6, extended from the centre, shall reach to the fourth proportional 3, In the same manner a third proportional is found to two numbers. Thus, to find a third...
Page 2 - 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.
Page 82 - Thus, if it were required to find a fourth proportional to 4, 8, and 6; because the lateral distance of the second term 8 cannot be made the parallel distance of the first term 4, take the lateral distance of 4, viz. the half of 8, and make it the parallel distance of the first term 4 ; then the parallel distance of the third term 6, shall reach from the centre to 6, viz.
Page 94 - ... the three angles of a triangle are together equal to two right angles, although it is not known to all.
Page 82 - ... reach to the fourth proportional 3. In the same manner, a third proportional is found to two numbers. Thus, to find a third proportional to 8 and 4, the sector remaining as in the former example, the parallel distance of 4, extended from the centre, shall reach to the third proportional 2.
Page 164 - If a solid angle be contained by three plane angles, any two of them are together greater than the third.
Page 27 - N. and if the firft be a multiple, or part of the fecond ; the third is the fame multiple, or the fame part of the fourth. Let A be to B, as C is to D ; and firft let A be a multiple of B ; C is the fame multiple of D. Take E equal to A, and whatever multiple A or E is of B, make F the fame multiple of D. then becaufe A is to B, as C is to D ; and of B the fecond and D the fourth equimultiples have been taken E and F...
Page 74 - From 1 to 2 From 2 to 3 From 3 to 4 From 4 to 5 From 5 to 6 From 6 to 7 From 7 to 8 From 8 to 9...
Page 39 - But in logarithms, division is performed by subtraction ; that is, the difference of -the logarithms of two num-bers, is the logarithm of the quotient of those numbers.
Page 237 - ... circumpolar, or so near to the elevated pole as to perform its apparent daily revolution about it without passing below the horizon, then the latitude of the place will be equal to the sum of the true altitude, and the codeclination or polar distance of the object; for this sum will obviously measure the elevation of the pole above the horizon, which is equal to the latitude.