Field and Colliery Surveying: A Primer Designed for the Use of Students of Surveying and Colliery Manager AspirantsMacmillan & Company, 1911 - 263 páginas |
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Página 86
... clamped so that it is retained at the vertical angle at which the observa- tion was made . When the star is approaching the western elongation the upper limb of the theodolite is turned so that the star may be sighted by the telescope ...
... clamped so that it is retained at the vertical angle at which the observa- tion was made . When the star is approaching the western elongation the upper limb of the theodolite is turned so that the star may be sighted by the telescope ...
Página 95
... clamped on the legs , and the needle having settled , the bearing is read off . In the meantime an assistant has pro- ceeded towards B , and as the road is straight a sight can be taken to this point . The dial is unclamped but not ...
... clamped on the legs , and the needle having settled , the bearing is read off . In the meantime an assistant has pro- ceeded towards B , and as the road is straight a sight can be taken to this point . The dial is unclamped but not ...
Página 100
... clamping screw , which render a fast needle survey impossible , in which case the method , which may be termed the " correcting deflection " method , may be advantageously adopted . Take Fig . 115 as an example of a roadway which is to ...
... clamping screw , which render a fast needle survey impossible , in which case the method , which may be termed the " correcting deflection " method , may be advantageously adopted . Take Fig . 115 as an example of a roadway which is to ...
Página 110
... clamped on the legs by the screw ( f ) and the peg ( c ) taken out , the sights can be moved in any direction required by turning the large milled - head screw ( b ) , and as the vernier is in the exact line between the sights , the ...
... clamped on the legs by the screw ( f ) and the peg ( c ) taken out , the sights can be moved in any direction required by turning the large milled - head screw ( b ) , and as the vernier is in the exact line between the sights , the ...
Página 112
... clamping screw . g and h sight vane clamps . k - axis for vertical arc . not required it is folded down on the outside of the compass box . A split collar or theodolite clamp ( see Fig . 132 ) replaces the clamping screw ( Fig . 129 ) ...
... clamping screw . g and h sight vane clamps . k - axis for vertical arc . not required it is folded down on the outside of the compass box . A split collar or theodolite clamp ( see Fig . 132 ) replaces the clamping screw ( Fig . 129 ) ...
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.