An Introduction to the Theory and Practice of Plane and Spherical Trigonometry, and the Stereographic Projection of the Sphere: Including the Theory of Navigation ... |
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Page 18
... drawn on a scale or ruler ; with which , proportions in common numbers , and trigonometry , may be solved by the application of a pair of compasses only . The method is founded on this property , That the logarithms of the terms of ...
... drawn on a scale or ruler ; with which , proportions in common numbers , and trigonometry , may be solved by the application of a pair of compasses only . The method is founded on this property , That the logarithms of the terms of ...
Page 26
... draw the line ABC , cutting the second G arc in c ; lastly , through c and D draw the line CD , and it will be the perpendicular required . PROBLEM II . A H D ( P ) From a given point c , not in the straight line GH , to draw a straight ...
... draw the line ABC , cutting the second G arc in c ; lastly , through c and D draw the line CD , and it will be the perpendicular required . PROBLEM II . A H D ( P ) From a given point c , not in the straight line GH , to draw a straight ...
Page 27
... draw the line DC , then CDB is the angle required . To make an angle of 150 ° . Produce the line BD to e , with the centre D and the chord of 60 ° describe a semi- circle , take the given obtuse angle from B -B 180 ° and set off the ...
... draw the line DC , then CDB is the angle required . To make an angle of 150 ° . Produce the line BD to e , with the centre D and the chord of 60 ° describe a semi- circle , take the given obtuse angle from B -B 180 ° and set off the ...
Page 29
... drawn upon the longest side of any triangle , from the opposite angle , it will fall within the triangle ; and the greater segment AD , will meet the greater ( AB ) of the other two sides , A B ED and the less segment DC , will meet the ...
... drawn upon the longest side of any triangle , from the opposite angle , it will fall within the triangle ; and the greater segment AD , will meet the greater ( AB ) of the other two sides , A B ED and the less segment DC , will meet the ...
Page 30
... drawn from the centre are equal . Thus ABDOHA is the circumference ; c the centre , and CA , CD , cb , CB , CF , are all equal to each other . ( D ) The distance from the centre of a circle to the circumfer- ence is called the radius ...
... drawn from the centre are equal . Thus ABDOHA is the circumference ; c the centre , and CA , CD , cb , CB , CF , are all equal to each other . ( D ) The distance from the centre of a circle to the circumfer- ence is called the radius ...
Other editions - View all
An Introduction to the Theory and Practice of Plain and Spherical ... Thomas Keith No preview available - 2017 |
An Introduction to the Theory and Practice of Plain and Spherical ... Thomas Keith No preview available - 2014 |
Common terms and phrases
acute adjacent angle altitude angle CAB Answer apparent altitude azimuth base centre circle co-tangent complement CONSTRUCTION cosec cosine degrees diff draw ecliptic equation Euclid find the angle formulæ given angle given side Given The side greater half the sum Hence horizon hypoth hypothenuse latitude less line of numbers line of sines logarithm logarithmical sine longitude measured meridian miles moon's Nautical Almanac North oblique observed obtuse opposite angle parallax parallel perpendicular Plate pole primitive PROPOSITION quadrant Rad x sine rad² radius right ascension right-angled spherical triangle RULE scale of chords scale of equal SCHOLIUM secant semi-tangents side AC sine A sine sine BC sine of half sine² species spherical angle spherical triangle ABC star star's straight line subtract sun's declination supplement tang tang AC tangent of half three sides Trigonometry versed sine
Popular passages
Page 25 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds.
Page 136 - Consequently, a line drawn from the vertex of an isosceles triangle to the middle of the base, bisects the vertical angle, and is perpendicular to the base.
Page 6 - And if the given number be a proper vulgar fraction ; subtract the logarithm of the denominator from the logarithm of the numerator, and the remainder will be the logarithm sought ; which, being that of a decimal fraction, must always have a negative index.
Page xxvi - A New Treatise on the Use of the Globes; or, a Philosophical View of the Earth and Heavens : comprehending an Account of the Figure, Magnitude, and Motion of the Earth : with the Natural Changes of its Surface, caused by Floods, Earthquakes, Ac.
Page 32 - The CO-SINE of an arc is the sine of the complement of that arc as L.
Page 31 - The sine, or right sine, of an arc, is the line drawn from one extremity of the arc, perpendicular to the diameter passing through the other extremity. Thus, BF is the sine of the arc AB, or of the arc BDE.
Page 240 - The HORIZON is a great circle which separates the visible half of the heavens from the invisible ; the earth being considered as a point in the centre of the sphere of the fixed stars.
Page 240 - ... ZENITH DISTANCE of any celestial object is the arc of a vertical circle, contained between the centre of that object and the zenith ; or it is what the altitude of the object wants of 90 degrees.
Page 197 - The sum of the two sides of a triangle is to their difference as the tangent of half the sum of the angles at the base is to the tangent of half their difference.
Page 32 - The SECANT of an arc, is a straight line drawn from the center, through one end of the arc, and extended to the tangent which is drawn from the other end.