## 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

ABCD Fig accuracy acres arrows ascertain back-sight base line Beam compasses calculated centre chain line circle circumference clamped clinometer coal colliery column commences deducted Describe dial diameter direction distance divisions drawing dumpy level eleven arrows equal example exterior angle fast needle feet Field Book figure find the area fore-sight graduated height hypothenuse inch inclination instrument length Let AB Fig line CD line drawn link chain loose needle magnetic bearing magnetic meridian magnetic needle mark meridian angle meridian line method Multiply necessary needle bearing needle survey number of degrees observation offsets ordinary paper parallel parallel ruler parallelogram perpendicular placed plotted pricker PROB protractor quadrilateral radius reduced level right angles road ruler scale screw seam shaft shown sides sight line spirit level square staff station surveyor taken taking telescope theodolite triangle trigonometry underground survey vernier reading vertical yards

### Popular passages

Page 22 - To draw a straight line at right angles to a given straight line, from a given point in the same.

Page 113 - Triangles on the same base, and between the same parallels, are equal.

Page 19 - Any two sides of a triangle are together greater than the third side.

Page 12 - A plane superficies is that in which any two points being taken, the straight line between them lies wholly in that superficies.

Page 16 - A diameter of a circle is a straight line drawn through the centre, and terminated both ways by the circumference.

Page 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.

Page 26 - RULE. — Multiply half the sum of the two parallel sides by the perpendicular distance between them, and the product will be the area.

Page 15 - 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 22 - ... 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 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.