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 8
... shown on the ruler . Let this point be D. A line joining DC will then be perpendicular to AB . The Straight Edge . The term " straight edge " literally includes all kinds of straight line rulers , but the name is generally applied to ...
... shown on the ruler . Let this point be D. A line joining DC will then be perpendicular to AB . The Straight Edge . The term " straight edge " literally includes all kinds of straight line rulers , but the name is generally applied to ...
Página 12
... shown the constructions of numerous problems , but the writer has deemed it sufficient to accept Euclid's proofs for the proposi- tions given in this work . If it is desired to refer to the proofs , almost all will be found in Euclid's ...
... shown the constructions of numerous problems , but the writer has deemed it sufficient to accept Euclid's proofs for the proposi- tions given in this work . If it is desired to refer to the proofs , almost all will be found in Euclid's ...
Página 24
... shown by CB , and draw lines parallel to CB from each of the divisions on AC so as to divide AB into fifty - two divisions as shown . We have now obtained the required scale in feet . To obtain the link scale we may produce AC and AB ...
... shown by CB , and draw lines parallel to CB from each of the divisions on AC so as to divide AB into fifty - two divisions as shown . We have now obtained the required scale in feet . To obtain the link scale we may produce AC and AB ...
Página 25
... shown that in a right- angled triangle the square of the hypothenuse is equal to the sum of the squares of the other two sides . Whence we have , where ( 1 ) and - AC hypothenuse BC = base AB perpendicular AC2 BC2 + AB2 - A ACBC2 + AB2 ...
... shown that in a right- angled triangle the square of the hypothenuse is equal to the sum of the squares of the other two sides . Whence we have , where ( 1 ) and - AC hypothenuse BC = base AB perpendicular AC2 BC2 + AB2 - A ACBC2 + AB2 ...
Página 28
... shown by rule ( 11 ) . Regular Polygon . — The inner radius of a polygon is the A B FIG . 65 . D A B FIG . 66 . F D radius of an inscribed circle ; the outer radius is the radius of a circumscribed circle . or ( 14 ) Area = } inner ...
... shown by rule ( 11 ) . Regular Polygon . — The inner radius of a polygon is the A B FIG . 65 . D A B FIG . 66 . F D radius of an inscribed circle ; the outer radius is the radius of a circumscribed circle . or ( 14 ) Area = } inner ...
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.