Colliery Surveying: A Primer Designed for the Use of Students and Colliery Manager Aspirants |
Other editions - View all
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue No preview available - 2018 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue No preview available - 2016 |
Colliery Surveying: A Primer Designed for the Use of Students and Colliery ... Thomas Aloysius O'Donahue No preview available - 2017 |
Common terms and phrases
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
Popular passages
Page 20 - To draw a straight line at right angles to a given straight line, from a given point in the same.
Page 111 - Triangles on the same base, and between the same parallels, are equal.
Page 17 - Any two sides of a triangle are together greater than the third side.
Page 10 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.
Page 14 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.
Page 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.
Page 24 - RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area.
Page 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.
Page 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.
Page 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.