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 58
Página 2
... obtained from the mineral owner , granting powers to get the seams of coal under certain lands . To define the limits or boundaries of the taking " or area to be worked , a surface survey is required . A survey of the workings of each ...
... obtained from the mineral owner , granting powers to get the seams of coal under certain lands . To define the limits or boundaries of the taking " or area to be worked , a surface survey is required . A survey of the workings of each ...
Página 10
... obtaining copies of plans and drawings . A tracing of the plan is first obtained , and the sensitised photographic paper is placed behind the tracing and secured in a printing frame . Exposure to the sun- light for a few minutes ...
... obtaining copies of plans and drawings . A tracing of the plan is first obtained , and the sensitised photographic paper is placed behind the tracing and secured in a printing frame . Exposure to the sun- light for a few minutes ...
Página 11
... obtained . The black line prints give a clearer drawing , and additions or alterations in the drawing are easily ... obtaining copies of drawings , but the process is not of the same value to mine surveyors . Owing to the bathing , which ...
... obtained . The black line prints give a clearer drawing , and additions or alterations in the drawing are easily ... obtaining copies of drawings , but the process is not of the same value to mine surveyors . Owing to the bathing , which ...
Página 24
... obtained the required scale in feet . To obtain the link scale we may produce AC and AB , continue the scale of equal parts on AC to sixty - six and con- tinue the scale on AB to sixty - six by paralleling from CB . We would then be ...
... obtained the required scale in feet . To obtain the link scale we may produce AC and AB , continue the scale of equal parts on AC to sixty - six and con- tinue the scale on AB to sixty - six by paralleling from CB . We would then be ...
Página 38
... obtained in this way . To minimise the error due to proportioning , the nearest tabular value should be taken and the difference for the minutes added or deducted as required . Thus in the preceding example the sine given , viz . 5671 ...
... obtained in this way . To minimise the error due to proportioning , the nearest tabular value should be taken and the difference for the minutes added or deducted as required . Thus in the preceding example the sine given , viz . 5671 ...
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.