A Treatise on Mine-surveying |
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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 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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