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
Resultados 1-5 de 16
Página 7
... moved a short distance apart , or brought close together . The position of the rulers with respect to each other is always parallel , and thus any number of parallel lines may be drawn . A much more efficient parallel ruler ( Fig . 9 ) ...
... moved a short distance apart , or brought close together . The position of the rulers with respect to each other is always parallel , and thus any number of parallel lines may be drawn . A much more efficient parallel ruler ( Fig . 9 ) ...
Página 87
... moved depends upon its mass and the sensitiveness of the particular needle in use , but for tram rails , 4 yards from the dial is usually sufficient . If the observation is a very important one , or one upon which the remainder of the ...
... moved depends upon its mass and the sensitiveness of the particular needle in use , but for tram rails , 4 yards from the dial is usually sufficient . If the observation is a very important one , or one upon which the remainder of the ...
Página 107
... moved to the right of the limb zero . Now what is wanted is the angular distance it has been moved , that is , the number of degrees between the zero of the limb and the zero of the vernier . If , therefore , the graduations on the limb ...
... moved to the right of the limb zero . Now what is wanted is the angular distance it has been moved , that is , the number of degrees between the zero of the limb and the zero of the vernier . If , therefore , the graduations on the limb ...
Página 108
... moved from the zero of the limb to the right , it is the proceeding vernier , therefore the lower set of figures of the vernier are read . Counting from the vernier zero it is found that the coinciding graduation is the fourth , and as ...
... moved from the zero of the limb to the right , it is the proceeding vernier , therefore the lower set of figures of the vernier are read . Counting from the vernier zero it is found that the coinciding graduation is the fourth , and as ...
Página 109
... moved to the left , and that the limb reading opposite the vernier zero is between 39 and 40 , or 39 + a number of minutes which will be found with the vernier . Looking along the vernier graduations as before , the coinciding line is ...
... moved to the left , and that the limb reading opposite the vernier zero is between 39 and 40 , or 39 + a number of minutes which will be found with the vernier . Looking along the vernier graduations as before , the coinciding line is ...
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.