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 33
Página 6
... placed between the two blades with a fine writing pen or the corner of a piece of paper , and the thickness of the line which can be drawn is determined by the width of opening between the points of the blades . A small milled - headed ...
... placed between the two blades with a fine writing pen or the corner of a piece of paper , and the thickness of the line which can be drawn is determined by the width of opening between the points of the blades . A small milled - headed ...
Página 7
... placed alongside the end or side of the board as required , and the blade being used as the ruler . Its application is illustrated by Fig . 7 . The Parallel Ruler . - This is the principal appliance FIG . 7 . FIG . 8 . employed for ...
... placed alongside the end or side of the board as required , and the blade being used as the ruler . Its application is illustrated by Fig . 7 . The Parallel Ruler . - This is the principal appliance FIG . 7 . FIG . 8 . employed for ...
Página 10
... placed over the new paper and the angular points of the drawing pricked through . Lines are then drawn from point to point as in the original . A much easier method , however , is to make a tracing of the plan and transfer the details ...
... placed over the new paper and the angular points of the drawing pricked through . Lines are then drawn from point to point as in the original . A much easier method , however , is to make a tracing of the plan and transfer the details ...
Página 13
... placed in the centre ; thus the angle contained by the two lines BA , AC is expressed as the angle BAC or CAB , and that which is contained by the lines AC , AD is expressed as the angle CAD or DAC . One angle is said to be less than ...
... placed in the centre ; thus the angle contained by the two lines BA , AC is expressed as the angle BAC or CAB , and that which is contained by the lines AC , AD is expressed as the angle CAD or DAC . One angle is said to be less than ...
Página 17
... placed at the top right - hand corner of the figure , a minute by a dash ( ' ) , and a second by two dashes ( " ) , as 42 ° 3 ′ 45 ′′ , which is equivalent to saying 42 degrees 3 minutes 45 seconds . Theorems I. The angles which a ...
... placed at the top right - hand corner of the figure , a minute by a dash ( ' ) , and a second by two dashes ( " ) , as 42 ° 3 ′ 45 ′′ , which is equivalent to saying 42 degrees 3 minutes 45 seconds . Theorems I. The angles which a ...
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.