The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtEvert Duyckinck, 1814 - 508 σελίδες |
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Σελίδα 42
... 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 termi- nated 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 termi- nated by the two sides , contains a greater or less number of degrees of the whole ...
Σελίδα 57
... degrees , and the chord AB be drawn : then AB = CB = AC . In the triangle ABC , the angle ACB is 60 de- grees , being measured by the arc AEB ; therefore the sum of the other two angles is 120 degrees ( by Cor . 1. theo . 5. ) but since ...
... degrees , and the chord AB be drawn : then AB = CB = AC . In the triangle ABC , the angle ACB is 60 de- grees , being measured by the arc AEB ; therefore the sum of the other two angles is 120 degrees ( by Cor . 1. theo . 5. ) but since ...
Σελίδα 72
... 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 ...
Σελίδα 82
... degrees expressed by those numbers . Every fifth degree is denoted by a line somewhat longer than the rest ; between every number and each fifth degree , there are four divi- sions , longer than the intermediate adjacent ones , these ...
... degrees expressed by those numbers . Every fifth degree is denoted by a line somewhat longer than the rest ; between every number and each fifth degree , there are four divi- sions , longer than the intermediate adjacent ones , these ...
Σελίδα 84
... degrees are under 60. 1. With any radius on a centre , describe the arch . 2. Make the same radius a transverse distance between 60 and 60 on the line of chords . 3. Take out the transverse distance of the given degrees , and lay this ...
... degrees are under 60. 1. With any radius on a centre , describe the arch . 2. Make the same radius a transverse distance between 60 and 60 on the line of chords . 3. Take out the transverse distance of the given degrees , and lay this ...
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acres altitude Answer arch base bearing blank line centre chains and links circle circle of latitude circumferentor Co-sec Co-tang column compasses contained decimal Dep Lat Dep difference Dist divided divisions draw east Ecliptic edge EXAMPLE feet field-book figures fore four-pole chains geometrical series given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied Natural Co-sines natural sine Nonius number of degrees object observed off-sets opposite parallelogram perches perpendicular plane pole pole star PROB proportion protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect semicircle Sextant side sights square root station stationary distance subtracted survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry vane versed sine vulgar fraction