The Theory and Practice of Surveying: Containing All the Instructions Requisite for the Skilful Practice of this ArtE. Duyckinck, 1811 - 508 σελίδες |
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Σελίδα 40
... perpendicular line let fall from one end thereof , to a diameter drawn to the other end : thus HL is the right sine of the arc HB . The sines on the same diameter increase till they come to the centre , and so become the ra- dius hence ...
... perpendicular line let fall from one end thereof , to a diameter drawn to the other end : thus HL is the right sine of the arc HB . The sines on the same diameter increase till they come to the centre , and so become the ra- dius hence ...
Σελίδα 41
... perpendicular to the end of the diameter , and is terminated by a line drawn from the centre through the other end : thus BK is the tangent of the arc HB . fig . 8 . 23. And the line which terminates the tan- gent , that is , CK , is ...
... perpendicular to the end of the diameter , and is terminated by a line drawn from the centre through the other end : thus BK is the tangent of the arc HB . fig . 8 . 23. And the line which terminates the tan- gent , that is , CK , is ...
Σελίδα 42
... perpendicular line let fall from one end thereof , to a diameter drawn to the other end : thus HL is the right sine of the arc HB . The sines on the same diameter increase till they come to the centre , and so become the ra- dius hence ...
... perpendicular line let fall from one end thereof , to a diameter drawn to the other end : thus HL is the right sine of the arc HB . The sines on the same diameter increase till they come to the centre , and so become the ra- dius hence ...
Σελίδα 47
... perpendicular to CD , then ( by def . 10. ) the angles CBA , and ABD , will be each a right angle . 2. But if EB fall slantwise on CD , then are the angles DBE + EBC = DBE + EBA ( = DBA ) + ABC , or two right angles . 2. E. D. Corollary ...
... perpendicular to CD , then ( by def . 10. ) the angles CBA , and ABD , will be each a right angle . 2. But if EB fall slantwise on CD , then are the angles DBE + EBC = DBE + EBA ( = DBA ) + ABC , or two right angles . 2. E. D. Corollary ...
Σελίδα 51
... perpendicular which bisects a given line , there be drawn right lines to the extremities of the given one , they with it will form an isosceles triangle . THEO . VII . PL . 1. fig . 25 . The angle BCD at the centre of a circle ABED , is ...
... perpendicular which bisects a given line , there be drawn right lines to the extremities of the given one , they with it will form an isosceles triangle . THEO . VII . PL . 1. fig . 25 . The angle BCD at the centre of a circle ABED , is ...
Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
acres altitude Answer arch azimuth base bearing blank line centre chains and links chord circle circumferentor Co-sec Co-tang column compasses contained decimal difference distance line divided divisions draw east Ecliptic edge feet field-book figures fore four-pole chains geom given number half the sum Horizon glass hypothenuse inches instrument Lat Dep Lat latitude length logarithm measure meridian distance multiplied natural co-sine natural sine needle Nonius number of degrees object observed off-sets opposite parallel parallelogram pegs perches perpendicular plane pole pole star Portmarnock PROB protractor Quadrant quotient radius right angles right line scale of equal SCHOLIUM screw Secant sect Sextant side sights square station stationary distance subtract Sun's survey taken Tang tangent theo theodolite trapezium triangle ABC trigonometry two-pole chains vane versed sine vulgar fraction whence
Δημοφιλή αποσπάσματα
Σελίδα 38 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Σελίδα 25 - 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, &c.
Σελίδα 197 - RULE. From half the sum of the three sides subtract each side severally.
Σελίδα 106 - C' (89) (90) (91) (92) (93) 112. In any plane triangle, the sum of any two sides is to their difference as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Σελίδα 27 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc. Thus BA is the versed sine of the arc AG.