A Treatise on Mine-surveying |
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Page v
... method from the other . Few mine - surveyors in Great Britain appear to be acquainted with the methods and instruments used abroad . This is the more to be regretted , as no mine - surveys made in this country approach in accuracy those ...
... method from the other . Few mine - surveyors in Great Britain appear to be acquainted with the methods and instruments used abroad . This is the more to be regretted , as no mine - surveys made in this country approach in accuracy those ...
Page viii
... Method of shadows , 2. Method of corresponding altitudes , 3. Determination of the meridian by means of the Pole star , 4. Determination of the meridian by means of a map , · Setting out the meridian line , Inclination of the magnetic ...
... Method of shadows , 2. Method of corresponding altitudes , 3. Determination of the meridian by means of the Pole star , 4. Determination of the meridian by means of a map , · Setting out the meridian line , Inclination of the magnetic ...
Page x
... XII . CALCULATION OF AREAS . Measures of area , Methods of calculating areas , 1. Method of triangles , 2. Method of ordinates , 3. Mechanical method , · · · 141 141 141 143 145 Produce of coal seams , The calculation of ore - X CONTENTS .
... XII . CALCULATION OF AREAS . Measures of area , Methods of calculating areas , 1. Method of triangles , 2. Method of ordinates , 3. Mechanical method , · · · 141 141 141 143 145 Produce of coal seams , The calculation of ore - X CONTENTS .
Page xi
... Methods employed , · 1. By means of an adit level , 2. By means of two shafts , 3. By means of one shaft , • 4. By means of a transit - instrument , 4a . The Severn tunnel method , 5. By means of a transit - theodolite , 6. By means of ...
... Methods employed , · 1. By means of an adit level , 2. By means of two shafts , 3. By means of one shaft , • 4. By means of a transit - instrument , 4a . The Severn tunnel method , 5. By means of a transit - theodolite , 6. By means of ...
Page xiii
... method , 269 ( 2. ) Thalén's method , 270 ( 3. ) Tiberg's method , 273 Use of the magnetic - needle in surveying bore - holes ,. 276 Employment of a powerful magnet in cases of uncertain holing , 279 PAGE 283 294 296 A MANUAL OF MINE ...
... method , 269 ( 2. ) Thalén's method , 270 ( 3. ) Tiberg's method , 273 Use of the magnetic - needle in surveying bore - holes ,. 276 Employment of a powerful magnet in cases of uncertain holing , 279 PAGE 283 294 296 A MANUAL OF MINE ...
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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 colour compass compass-box 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 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 plate plotting plumb-bob plumb-line plummet position protractor represented right angles safety-lamp scale seam shaft side Silver King spirit-level square staff station station-line strike and dip surface surface-surveys survey tacheometer tacheometry taken tangent screw telescope theodolite transit-theodolite traverse triangle tripod tube underground vernier vernier-plate vertical angles wire yards zero