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 134
... ground , are measured either by Gunter's chain of four poles or perches , which consists of 100 links ( and this is the most natural division ) or by one of 50 links , which contains two poles or perches : but because the length of a ...
... ground , are measured either by Gunter's chain of four poles or perches , which consists of 100 links ( and this is the most natural division ) or by one of 50 links , which contains two poles or perches : but because the length of a ...
Σελίδα 136
... ground ; and leaving it there , he draws on the chain till the hinder man checks him when he arrives at that peg : the chain being again stretched , the fore man sticks down another peg , and the hind man takes up the former ; and thus ...
... ground ; and leaving it there , he draws on the chain till the hinder man checks him when he arrives at that peg : the chain being again stretched , the fore man sticks down another peg , and the hind man takes up the former ; and thus ...
Σελίδα 140
... ground for houses is measured by feet , we will shew how to re- duce one to the other , in the following problems . PROB . I. To reduce two - pole chains and links to four - pole ones . If the number of chains be even , the half of them ...
... ground for houses is measured by feet , we will shew how to re- duce one to the other , in the following problems . PROB . I. To reduce two - pole chains and links to four - pole ones . If the number of chains be even , the half of them ...
Σελίδα 145
... ground , by going round it , and the me thod of taking the angles of the field , by the chain only . PL . 6. fig . 6 . Let ABCDEFG be a piece of ground to be sur- veyed : beginning at the point A , let one chain be laid in a direct line ...
... ground , by going round it , and the me thod of taking the angles of the field , by the chain only . PL . 6. fig . 6 . Let ABCDEFG be a piece of ground to be sur- veyed : beginning at the point A , let one chain be laid in a direct line ...
Σελίδα 146
... ground . Proceed we then as before , from E to F , to G , and thence to A , measuring the angles and distances , and placing them as before , in the field - book , oppo- site to their respective stations ; so will the field- book be ...
... ground . Proceed we then as before , from E to F , to G , and thence to A , measuring the angles and distances , and placing them as before , in the field - book , oppo- site to their respective stations ; so will the field- book be ...
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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