A Treatise on Mine-surveying |
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Page xiv
... from several levels , 232 The cubical content of a mine - reservoir , 233 Determination of the strike and dip of the line of intersection of two veins , 234 The search for dislocated lodes , Irregularities of seams and xiv CONTENTS .
... from several levels , 232 The cubical content of a mine - reservoir , 233 Determination of the strike and dip of the line of intersection of two veins , 234 The search for dislocated lodes , Irregularities of seams and xiv CONTENTS .
Page 2
... intersection . The two straight - edges were provided at each extremity with sight vanes , from which plumb - lines were suspended so as to enable the instrument to be levelled . With Hero's improved instrument , any angle could be ...
... intersection . The two straight - edges were provided at each extremity with sight vanes , from which plumb - lines were suspended so as to enable the instrument to be levelled . With Hero's improved instrument , any angle could be ...
Page 19
... intersection . The points of intersection of all straight lines , as well as the angles of the triangles , are always points measured to or from . They are called stations , and the lines connecting them station - lines . Secondary ...
... intersection . The points of intersection of all straight lines , as well as the angles of the triangles , are always points measured to or from . They are called stations , and the lines connecting them station - lines . Secondary ...
Page 95
... intersection of the cross - wires upon some well- defined distant object . The telescope is turned round on its collars in the Y's until the level is uppermost . Then , if the cross - wires do not continue to coincide with the object ...
... intersection of the cross - wires upon some well- defined distant object . The telescope is turned round on its collars in the Y's until the level is uppermost . Then , if the cross - wires do not continue to coincide with the object ...
Page 96
... intersection of the cross - wires to an object , the altitude of which is considerable . Then turn the vertical limb , until the cross - wires cut some other well - defined point near the ground . Revolve the telescope on its axis , and ...
... intersection of the cross - wires to an object , the altitude of which is considerable . Then turn the vertical limb , until the cross - wires cut some other well - defined point near the ground . Revolve the telescope on its axis , and ...
Contents
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Common terms and phrases
accuracy accurate adjusted back-sight base-line bearing bore-hole brass calculated centre chain City Guilds clamped clinometer coal colliery collimation coloured compass contour lines cord corner cosec cotan cross-wires curve determined direction distance employed equal error fathoms feet fixed fore-sight glass graduated ground height hole horizontal circle inches inches in diameter inclination instrument intersection latitude length line of sight lode magnetic bearing magnetic meridian magnetic-needle marked means measured method metres mine-surveying miner's dial mines needle observations obtained offsets Ordnance Survey parallel parallel ruler perpendicular placed plane planimeter plate plotting plumb-bob plumb-line plummet position protractor represents right angles safety-lamp scale seam shaft side spirit-level square staff station station-line strike and dip surface surface-surveys survey tacheometer tacheometry tangent screw telescope theodolite transit-theodolite traverse triangle tripod tube underground vernier vernier-plate vertical angles wire yards
Popular passages
Page 17 - A Pocketbook of Electrical Rules and Tables for the use of Electricians and Engineers.
Page 16 - TABLE, in place of the usual Fifteen minute computations required. This alone is evidence of the assistance which the Tables ensure to every user, and as every Surveyor in active practice has felt the want of such assistance FEW KNOWING OF THEIR PUBLICATION WILL REMAIN WITHOUT THEM.
Page 25 - Contains the pith of what has been written by the best scholars on the subject. The notes comprise everything that the student can want.
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