A Treatise on Mine-surveying |
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Common terms and phrases
accuracy accurate adjustment alidade attached back-sight ball-and-socket joint bearing bisect bore-hole brass bubble calculated centre chain chain-line City Guilds clinometer co-ordinates colliery collimation compass compass-box contour lines correct cosec cross-wires determined direction distance divisions dumpy level employed equal error fathoms feet fixed fore-sight graduated ground height hole horizontal circle inches inclination Inst instrument intersection latitude latter length levelling screws lode magnetic azimuth magnetic meridian magnetic-needle marked means measured method millimetres mine-surveying miner's dial mines needle observations obtained offsets parallel ruler perpendicular placed plane plane table plate plotting plumb-bob plumb-line plummet pole position protractor represents right angles scale seam shaft shown in Fig side spirit level staff station surface surface-surveys survey surveyor tacheometer taken tangent screw telescope theodolite traverse triangle tribrach instruments tripod tube tunnel underground usually vernier clamp vernier dial vernier readings vertical angles vertical circle wire yards zero
Popular passages
Page ii - Illustrated. 6s. net. A- HANDBOOK ON THEODOLITE SURVEYING AND LEVELLING, For the use of Students in Land and Mine Surveying. BY PROFESSOR JAMES PARK, FGS CONTENTS.
Page 392 - An accurate plan of the mine or seam, showing — (a) The boundaries of the workings of the mine or seam, including not only the working faces but also all...
Page 434 - The instrument described in this paper consists essentially of a photographic camera fitted inside with a magnetic needle, which carries a vertical transparent scale divided and numbered to 360°, and also with cross fibres which intersect at right angles. The fittings and adjustments of the instrument are of such a character that the camera can be accurately levelled and directed towards any point in a horizontal direction, and when a photograph is taken in an ordinary way the bearing of the median...
Page 386 - There shall be kept at every mine tracings of the workings of the mine up to a date not more than three months previously, showing the ventilation and all principal doors, stoppings and air crossings, regulators and telephone stations, and distinguishing the intake air by a different colour from the return air, which tracings shall be in a suitable form for use by the brigades.
Page 434 - ... the instrument through the photographic lens, will be recorded automatically on the face of the photograph. The vertical fibre (and its image on the photograph) serves as an index to read the bearing ; and the same fibre marks, by its shadow, a line right across the photograph, which marks the median vertical plane on the image. The horizontal fibre is adjusted to mark on the image the horizontal plane which bisects the photographic lens. The camera rests on a divided horizontal circle, which...
Page ii - Meridian and Bearings. — The Theodolite Traverse. — Co-ordinates of a Station. — Calculation of Omitted or Connecting Line in a Traverse. — Calculation of Areas. — Subdivision of Land. — Triangulation. — Determination of True Meridian, Latitude and Time. — Levelling. — Kailway Curves. — Mine Surveying. — Surveying Boreholes. — INDEX. "A book which should prove as useful to the professional surveyor as to the student."— Nature.
Page 392 - MH 44 shall, within three months after the abandonment, send to a Secretary of State : (i.) An accurate plan of the mine or seam, being either the original working plan or an accurate copy thereof made by a competent...
Page 392 - Act. produce to him at the office at the mine such plan and section, and shall also on the like request mark on such plan and section...
Page 171 - The sum of the interior angles of a polygon is equal to twice as many right angles as the polygon has sides, less four right angles.
Page 207 - A little circular disc of an inch and a half diameter, and having a short round pivot projecting above its upper surface, is first securely screwed to the telescope axis. Upon this pivot rests the enlarged base of the polar axis, which is also firmly connected with the disc by four capstan head screws passing from the under side of the disc into the base already named.