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
... Horizon 175 Dip for Dif . Dist of land 257 Semidiameter of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and Pole 177 Land 271 Sun's Declination 178 8 ...
... Horizon 175 Dip for Dif . Dist of land 257 Semidiameter of the Sun ibid . 6. Changing the scale of Maps Transit of Pole Star 176 263 Difference of Altitude of 7. Method of Dividing Pole Star and Pole 177 Land 271 Sun's Declination 178 8 ...
Σελίδα 137
... is most usual ) as d is over A , while the leader puts down his peg at e : the eye can direct the horizon- tal position near enough , but if greater accuracy T were required , a quadrant applied to the chain , OF THE CHAIN . 137.
... is most usual ) as d is over A , while the leader puts down his peg at e : the eye can direct the horizon- tal position near enough , but if greater accuracy T were required , a quadrant applied to the chain , OF THE CHAIN . 137.
Σελίδα 138
... horizon- tal ones ; for all trees which grow upon any inclined surface , do not grow perpendicular thereto , but to the plane of the horizon : thus if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to ...
... horizon- tal ones ; for all trees which grow upon any inclined surface , do not grow perpendicular thereto , but to the plane of the horizon : thus if Ad , ef , gh , & c . were trees on the side of a hill , they grow per- pendicular to ...
Σελίδα 152
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying there is also a brass ...
... horizon nearly , when the instrument is horizontal , and the needle at rest . The box is covered with a glass lid , in a brass rim , to prevent the needle being disturbed by wind or rain , at the time of surveying there is also a brass ...
Σελίδα 169
... horizon ; let the instrument be placed in this situa- tion before the object , so that the top thereof may be seen through the sights ; let a plummet be sus- pended from the centre pin , and the object being then observed , the ...
... horizon ; let the instrument be placed in this situa- tion before the object , so that the top thereof may be seen through the sights ; let a plummet be sus- pended from the centre pin , and the object being then observed , the ...
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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