Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager AspirantsMacmillan, 1896 - 163 páginas |
Dentro del libro
Resultados 1-5 de 27
Página 5
... 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 6
... 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 O 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 O FIG . 7 . FIG . 8 . employed for ...
Página 9
... 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 11
... 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 15
... 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 . The angle indicated by seconds is so ...
... 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 . The angle indicated by seconds is so ...
Otras ediciones - Ver todas
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Sin vista previa disponible - 2018 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Sin vista previa disponible - 2016 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue Sin vista previa disponible - 2017 |
Términos y frases comunes
accuracy acres ascertain back-sight base line bearing is taken calculated centre chain line clinometer colliery column commences correct bearing datum line deducted dial is clamped diameter direction distance dumpy level end of line equal example feet figure find the area fore-sight height horizontal inch inclination instrument isogonic lines legs length limb line drawn line of sight Link Chain loose needle bearing magnetic bearing magnetic declination magnetic meridian magnetic needle mark measurements meridian angle meridian line method Multiply necessary north and south north end number of degrees offsets ordinary parallel parallel ruler perpendicular placed plotted pricker PROB protractor reduced level right angles road ruler screw seam shaft shown by Fig side sight line spirit level square staff station straight line surveyor taking telescope theodolite triangle true north underground survey vane vernier plate vernier reading vertical angles Walney Island yards zero
Pasajes populares
Página 20 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Página 111 - Triangles on the same base, and between the same parallels, are equal.
Página 17 - Any two sides of a triangle are together greater than the third side.
Página 10 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Página 14 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Página 17 - 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 24 - RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area.
Página 13 - A circle is a plane figure contained by one line, which is called the circumference, and is such that all straight lines drawn from a certain point within the figure to the circumference, are equal to one another.
Página 20 - ... are together greater than the. third. Let A, B, C be the three given lines, any two of which are together greater than the third.
Página 19 - 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.