Field and Colliery Surveying: A Primer Designed for the Use of Students of Surveying and Colliery Manager AspirantsMacmillan & Company, 1911 - 263 páginas |
Dentro del libro
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Página 156
... departure . If a second traverse bc be made , this also can be resolved into two lines representing its latitude and departure . Thus the angle which bc makes with the base line is ebc , and from this angle and the length of bc the ...
... departure . If a second traverse bc be made , this also can be resolved into two lines representing its latitude and departure . Thus the angle which bc makes with the base line is ebc , and from this angle and the length of bc the ...
Página 157
... departure may be east or west . If some base line other than the magnetic meridian be adopted , the latitudes in the ... departure is obtained by multiplying the length of the traverse by the sine of the angle ( see rule 1 , page 33 ) ...
... departure may be east or west . If some base line other than the magnetic meridian be adopted , the latitudes in the ... departure is obtained by multiplying the length of the traverse by the sine of the angle ( see rule 1 , page 33 ) ...
Página 158
... departure column for distance 1 is the sine of the angle , and the corresponding latitude column is the cosine of ... departure db , we refer to the figure opposite 30 degrees in the traverse tables . The first figure in the length is 2 ...
... departure column for distance 1 is the sine of the angle , and the corresponding latitude column is the cosine of ... departure db , we refer to the figure opposite 30 degrees in the traverse tables . The first figure in the length is 2 ...
Página 159
... DEPARTURE . N. + S.- E. + W. - N. 13 W. 460 400 = 389.75 89.98 60 = 3 58.46 13.49 N. 22 W. 600 556.31 224.76 615 10 9.27 3.74 5 = 4.63 1.87 N. 80 E. 518 500 = 86.82 492.40 10 = 1.73 9.84 8 = 1.38 7.87 N. 68 E. 300 = 112.38 278.16 340 40 ...
... DEPARTURE . N. + S.- E. + W. - N. 13 W. 460 400 = 389.75 89.98 60 = 3 58.46 13.49 N. 22 W. 600 556.31 224.76 615 10 9.27 3.74 5 = 4.63 1.87 N. 80 E. 518 500 = 86.82 492.40 10 = 1.73 9.84 8 = 1.38 7.87 N. 68 E. 300 = 112.38 278.16 340 40 ...
Página 160
... departures in the same way we have 539.89 departure E. These figures give the differences in latitude and departure between the starting - point and the end of the traverse , and we may lay this point on the plan from the figures ...
... departures in the same way we have 539.89 departure E. These figures give the differences in latitude and departure between the starting - point and the end of the traverse , and we may lay this point on the plan from the figures ...
Términos y frases comunes
accuracy accurate acres adjusted alidade ascertain back-sight calculated centre chain line chord clamped clinometer coal colliery column commences compass box contour lines datum line dial difference direction distance division drawing drawn dumpy level equal error example fast needle feet Field Book figure fixed fore-sight frustum graduated Gunter's chain height horizontal hypothenuse inch inclination instrument isogonic lines legs length limb magnetic bearing magnetic declination magnetic meridian magnetic needle marked means measurements meridian angle meridian base line meridian line method necessary needle survey observation obtained offsets parallel parallel ruler perpendicular placed plotted pricker protractor radius reduced level right angles road ruler scale screw seam shaft shown by Fig side sight line sight vanes spirit level square station straight line surveyor taken taking telescope theodolite tie line traverse triangle true north underground survey vernier plate vernier reading yards zero
Pasajes populares
Página 22 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Página 164 - Triangles on the same base, and between the same parallels, are equal.
Página 19 - Any two sides of a triangle are together greater than the third side.
Página 249 - A section of the strata sunk through, or, if that is not reasonably " practicable, a statement of the depth of the shaft with a section
Página 248 - Every such plan must be on a scale of not less than that of the Ordnance Survey of twenty-five inches to the mile, or on the same scale as the plan for the time being in use at the mine.
Página 16 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 19 - When the three angles of one are equal to the three angles of the other, each to each, the adjoining diagram shews that the triangles need not be equal in all respects.
Página 12 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Página 21 - To bisect a given finite straight line, that is, to divide it into two equal parts. Let AB be the given straight line; it is required to divide it into two equal parts.
Página 34 - We have, then, that the sine of an angle is equal to the cosine of its complement, and conversely.