A Treatise on Mine-surveying |
From inside the book
Results 1-5 of 56
Page 3
... plane . In Great Britain , instructions for making mine - surveys were published by Thomas Houghton in 1681 for the Derbyshire miners , by William Pryce in 1778 for the Cornish miners , and by Thomas Fenwick in 1804 for the Newcastle ...
... plane . In Great Britain , instructions for making mine - surveys were published by Thomas Houghton in 1681 for the Derbyshire miners , by William Pryce in 1778 for the Cornish miners , and by Thomas Fenwick in 1804 for the Newcastle ...
Page 5
... planes , is termed the thickness . The adjacent rock on both sides of these two planes is termed the country , the portion ... plane . Its dip is the inclination downwards measured in degrees from the horizontal . As the dip of veins is ...
... planes , is termed the thickness . The adjacent rock on both sides of these two planes is termed the country , the portion ... plane . Its dip is the inclination downwards measured in degrees from the horizontal . As the dip of veins is ...
Page 10
... plane triangles are deduced from the principles that the sum of the three angles of a plane triangle is equal to two right angles , and that the sides of the triangle are proportional to the sines of the opposite angles . For right ...
... plane triangles are deduced from the principles that the sum of the three angles of a plane triangle is equal to two right angles , and that the sides of the triangle are proportional to the sines of the opposite angles . For right ...
Page 13
... on Slopes . - In chaining up or down a slope , the distance must be reduced on the plan to the projection of that distance on a horizontal plane . If the slope is THE MEASUREMENT OF DISTANCES . 13 Offsets, Chaining on slopes,
... on Slopes . - In chaining up or down a slope , the distance must be reduced on the plan to the projection of that distance on a horizontal plane . If the slope is THE MEASUREMENT OF DISTANCES . 13 Offsets, Chaining on slopes,
Page 14
Bennett H. Brough. distance on a horizontal plane . If the slope is gentle , the lower end of the chain may be raised until the chain is level . To Gunter's Chain . Angle . Degrees . Slope . Correction in Links . 10 - fathom Chain ...
Bennett H. Brough. distance on a horizontal plane . If the slope is gentle , the lower end of the chain may be raised until the chain is level . To Gunter's Chain . Angle . Degrees . Slope . Correction in Links . 10 - fathom Chain ...
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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
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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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