A Treatise on Mine-surveying |
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Results 1-5 of 54
Page 1
... necessary to determine the relative positions of any points on the earth's surface . From such measurements a map , or plan , of any portion of the surface may be drawn , and its area calculated . All surveys are conducted upon nearly ...
... necessary to determine the relative positions of any points on the earth's surface . From such measurements a map , or plan , of any portion of the surface may be drawn , and its area calculated . All surveys are conducted upon nearly ...
Page 2
... necessary to determine them by measurement every year . The oldest evidence of the solution of mathematical problems is afforded by a papyrus in the British Museum , which is believed to have been copied , 1,700 years B.C. , from a much ...
... necessary to determine them by measurement every year . The oldest evidence of the solution of mathematical problems is afforded by a papyrus in the British Museum , which is believed to have been copied , 1,700 years B.C. , from a much ...
Page 4
... necessary theoretical training , as also do the local classes held under the Science and Art Depart- ment , and under the City and Guilds of London Technical Insti- tution . Another cause which has retarded the progress of mine - sur ...
... necessary theoretical training , as also do the local classes held under the Science and Art Depart- ment , and under the City and Guilds of London Technical Insti- tution . Another cause which has retarded the progress of mine - sur ...
Page 11
... necessary , in each case , to determine the angle of inclination formed by the measured line and the horizon . Lines are usually measured with chains , tapes , or rods , divided into fathoms , yards , links , feet , or some other unit ...
... necessary , in each case , to determine the angle of inclination formed by the measured line and the horizon . Lines are usually measured with chains , tapes , or rods , divided into fathoms , yards , links , feet , or some other unit ...
Page 15
... necessary in mine - surveying practice . The optical square consists of two small mirrors placed in a brass box at an angle of 45 ° , thus reflecting an object through an angle of 90 ° . The unsilvered half of one mirror gives a direct ...
... necessary in mine - surveying practice . The optical square consists of two small mirrors placed in a brass box at an angle of 45 ° , thus reflecting an object through an angle of 90 ° . The unsilvered half of one mirror gives a direct ...
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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