A Treatise on Mine-surveying |
From inside the book
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Page 2
... circles . That the important mines of the ancient Greeks necessitated the solution of mine - surveying problems is shown by the fact that such problems are fully discussed by Hero of Alexandria ( B.C. 285-222 ) , several of whose works ...
... circles . That the important mines of the ancient Greeks necessitated the solution of mine - surveying problems is shown by the fact that such problems are fully discussed by Hero of Alexandria ( B.C. 285-222 ) , several of whose works ...
Page 8
... circle is divided into 360 parts ; each part being termed a " degree . " The degree is divided into 60 minutes , and the minute into 60 seconds . This is known as the sexagesimal division . The French centesimal division of the quadrant ...
... circle is divided into 360 parts ; each part being termed a " degree . " The degree is divided into 60 minutes , and the minute into 60 seconds . This is known as the sexagesimal division . The French centesimal division of the quadrant ...
Page 11
... circle . A swivel - handle is provided at each end of the chain . The wire used in the construction of iron chains is usually No. 8 W.G .; that used for steel chains is No. 12 , or No. 8 W.G. The hundredth part of the chain is called a ...
... circle . A swivel - handle is provided at each end of the chain . The wire used in the construction of iron chains is usually No. 8 W.G .; that used for steel chains is No. 12 , or No. 8 W.G. The hundredth part of the chain is called a ...
Page 20
... circle or a triangle , and its termination by a line drawn across the page . A station left in a line , to or from which another line is to be measured , is usually represented by its number enclosed in a circle . A turn to the right or ...
... circle or a triangle , and its termination by a line drawn across the page . A station left in a line , to or from which another line is to be measured , is usually represented by its number enclosed in a circle . A turn to the right or ...
Page 26
... circles filled with wax of different colours ; in the middle is a depressed receptacle to contain the magnetic - needle . An old compass of this type is preserved in the collection of the School of Mines of Clausthal in the Harz . It ...
... circles filled with wax of different colours ; in the middle is a depressed receptacle to contain the magnetic - needle . An old compass of this type is preserved in the collection of the School of Mines of Clausthal in the Harz . It ...
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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