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 38
... comprehended is called a circle ; and the curve line described by the point B , is called the circumference or the periphery of the circle ; the fixed point C , is called its centre . 14. The describing line CB . ( fig . 8. 38 GEOMETRY .
... comprehended is called a circle ; and the curve line described by the point B , is called the circumference or the periphery of the circle ; the fixed point C , is called its centre . 14. The describing line CB . ( fig . 8. 38 GEOMETRY .
Σελίδα 39
... centre to the circumference : whence all radii of the same or of equal circles are equal . 15. The diameter of a circle is a right line drawn thro ' the centre , and terminating in opposite points of the circumference ; and it divides ...
... centre to the circumference : whence all radii of the same or of equal circles are equal . 15. The diameter of a circle is a right line drawn thro ' the centre , and terminating in opposite points of the circumference ; and it divides ...
Σελίδα 40
... centre , and so become the ra- dius hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8. ) must be per- pendicular to the diameter ( by def . 20 ...
... centre , and so become the ra- dius hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8. ) must be per- pendicular to the diameter ( by def . 20 ...
Σελίδα 41
... 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 called the secant of the are HB . fig . 8 . 24. What an arc wants of a quadrant is ...
... 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 called the secant of the are HB . fig . 8 . 24. What an arc wants of a quadrant is ...
Σελίδα 42
... centre , and so become the ra- dius hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8. ) must be per- pendicular to the diameter ( by def . 20 ...
... centre , and so become the ra- dius hence it is plain that the radius CD is the greatest possible sine , and thence is called the whole sine . Since the whole sine CD ( fig . 8. ) must be per- pendicular to the diameter ( by def . 20 ...
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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.