A Treatise on Mine-surveying |
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Page 7
... fathom of 6 feet or 2 yards . The chain of 66 feet or 22 yards ; divided into 4 poles of 5 yards , and 100 links of 7.92 inches . The statute mile of 1,760 yards or 5,280 ... fathoms ( toises ) . GENERAL EXPLANATIONS . 7 Measures of length,
... fathom of 6 feet or 2 yards . The chain of 66 feet or 22 yards ; divided into 4 poles of 5 yards , and 100 links of 7.92 inches . The statute mile of 1,760 yards or 5,280 ... fathoms ( toises ) . GENERAL EXPLANATIONS . 7 Measures of length,
Page 8
Bennett H. Brough. lated to be 5130740-74 French fathoms ( toises ) . The ten- millionth part of this length ( 0 ... Fathom . Feet . Fathom , 1.000 6.000 Metre , 0.546 3.280 Swedish Famn , . 0.973 5.844 Russian Sashon , 1.166 7.000 ...
Bennett H. Brough. lated to be 5130740-74 French fathoms ( toises ) . The ten- millionth part of this length ( 0 ... Fathom . Feet . Fathom , 1.000 6.000 Metre , 0.546 3.280 Swedish Famn , . 0.973 5.844 Russian Sashon , 1.166 7.000 ...
Page 11
... fathoms , yards , links , feet , or some other unit of measure- ment . ( a . ) The Chain . The instrument most frequently used in sur- veying is the chain . In coal - mines and in field - surveying , Gunter's chain is employed . It is ...
... fathoms , yards , links , feet , or some other unit of measure- ment . ( a . ) The Chain . The instrument most frequently used in sur- veying is the chain . In coal - mines and in field - surveying , Gunter's chain is employed . It is ...
Page 13
... fathoms or 60 feet in length , and is provided with brass marks at every fathom . Each link of the chain is 6 inches in length . The chain is some- times made entirely of brass . No advantage is gained by using Gunter's chain in a ...
... fathoms or 60 feet in length , and is provided with brass marks at every fathom . Each link of the chain is 6 inches in length . The chain is some- times made entirely of brass . No advantage is gained by using Gunter's chain in a ...
Page 14
... fathom Chain . Correction in Feet . 100 - foot Chain . Correction in Feet . 3 1 in 19.08 0.14 0.08 0.14 4 1 in 14:30 0.24 0.14 0.24 5 1 in 11:43 0.38 0.22 0.38 6 1 in 9.51 0.54 0.32 0.54 7 1 in 8.14 0.74 0.44 0.74 8 1 in 7.11 0.97 0.58 ...
... fathom Chain . Correction in Feet . 100 - foot Chain . Correction in Feet . 3 1 in 19.08 0.14 0.08 0.14 4 1 in 14:30 0.24 0.14 0.24 5 1 in 11:43 0.38 0.22 0.38 6 1 in 9.51 0.54 0.32 0.54 7 1 in 8.14 0.74 0.44 0.74 8 1 in 7.11 0.97 0.58 ...
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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
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