The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtJ.J. Harper, 1828 - 435 páginas |
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Página 39
... degrees as the arc contains parts of 360 so the radius being the sine of a quadrant , becomes the sine of 90 degrees , or the fourth part of the circle , which is 360 degrees . 21. The versed sine of an arc is that part of the diameter ...
... degrees as the arc contains parts of 360 so the radius being the sine of a quadrant , becomes the sine of 90 degrees , or the fourth part of the circle , which is 360 degrees . 21. The versed sine of an arc is that part of the diameter ...
Página 40
... degrees , the angle HCB is an angle of 60 degrees . Hence angles are greater or less according as the arc described about the angular point , and terminated by the two sides , contains a greater or less number of degrees of the whole ...
... degrees , the angle HCB is an angle of 60 degrees . Hence angles are greater or less according as the arc described about the angular point , and terminated by the two sides , contains a greater or less number of degrees of the whole ...
Página 46
... degrees , therefore 180- the given angle will be equal to the sum of the other two ; or 180 -the sum of two given angles gives the other one . Cor . 2. In every right angled triangle , the two acute angles are = 90 degrees , or to one ...
... degrees , therefore 180- the given angle will be equal to the sum of the other two ; or 180 -the sum of two given angles gives the other one . Cor . 2. In every right angled triangle , the two acute angles are = 90 degrees , or to one ...
Página 50
... degrees is always equal in length to the radius . Thus in the circle AEBD , if the arc AEB be an arc of 60 degrees , and the chord AB be drawn : then AB = CB = AC . In the triangle ABC , the angle ACB is 60 degrees , being mea- sured by ...
... degrees is always equal in length to the radius . Thus in the circle AEBD , if the arc AEB be an arc of 60 degrees , and the chord AB be drawn : then AB = CB = AC . In the triangle ABC , the angle ACB is 60 degrees , being mea- sured by ...
Página 60
... degrees , at the point A , of the line AB , suppose of 45 degrees . From a scale of chords take 60 degrees , for 60 ° is equal to the radius , ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from ...
... degrees , at the point A , of the line AB , suppose of 45 degrees . From a scale of chords take 60 degrees , for 60 ° is equal to the radius , ( by cor . theo . 15. ) and with that distance from A , as a centre , describe a circle from ...
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Términos y frases comunes
ABCD acres altitude Answer arch base bearing centre chains and links circle circumferentor Co-sec Co-tang column compasses contained cube root decimal difference of latitude Dist divided divisions divisor draw east Ecliptic edge EXAMPLE feet field-book figure four-pole chains given angle given number half the sum height Hence Horizon glass hypothenuse inches instrument length logarithm measure Meridian Altitude meridian distance method multiplied natural co-sine natural number natural sine Nonius number of degrees object observed off-sets opposite parallel parallelogram perches perpendicular plane prob PROBLEM proportional protractor Quadrant quotient radius rhombus right angles right line Secant sect semicircle Sextant side square root station subtract Sun's survey taken Tang tangent theo theodolite THEOREM trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence