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 37
... drawn between any two points , as the line AB . fig . 1. but if it be not the shortest , it is then called a curve line , as AB . fig . 2 . 6. A superficies or surface is considered only as having length and breadth , without thickness ...
... drawn between any two points , as the line AB . fig . 1. but if it be not the shortest , it is then called a curve line , as AB . fig . 2 . 6. A superficies or surface is considered only as having length and breadth , without thickness ...
Σελίδα 39
... drawn thro ' the centre , and terminating in opposite points of the circumference ; and it divides the circle and circumference into two equal parts , called semicir- cles ; and is double the radius , as AB or DE . fig . 8 .. 16. The ...
... drawn thro ' the centre , and terminating in opposite points of the circumference ; and it divides the circle and circumference into two equal parts , called semicir- cles ; and is double the radius , as AB or DE . fig . 8 .. 16. The ...
Σελίδα 40
... 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 it is plain that the radius CD is the greatest possible sine ...
... 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 it is plain that the radius CD is the greatest possible sine ...
Σελίδα 41
... drawn from the centre through the other end : thus BK is the tangent of the arc HB . fig . 8 . 23. And the line ... draw- ing them according to def . 20 , there results the self - same line ; thus HL is the sine of the arc HB , or of its ...
... drawn from the centre through the other end : thus BK is the tangent of the arc HB . fig . 8 . 23. And the line ... draw- ing them according to def . 20 , there results the self - same line ; thus HL is the sine of the arc HB , or of its ...
Σελίδα 42
... 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 it is plain that the radius CD is the greatest possible sine ...
... 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 it is plain that the radius CD is the greatest possible sine ...
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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.