A Treatise on Mine-surveying |
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Page 15
... graduated arc on which angles are measured . Offsets are ordinates or transverse distances measured from known points on a station - line to objects the position of which is to be ascertained . Offsets , as a rule , are measured at ...
... graduated arc on which angles are measured . Offsets are ordinates or transverse distances measured from known points on a station - line to objects the position of which is to be ascertained . Offsets , as a rule , are measured at ...
Page 28
... graduated , but each division contains 10 ° , and the numbers proceed from the north and south points to 90 ° on each side , thus dividing the inner circle into four quadrants of 90 ° each . On a finely pointed pin fixed in the centre ...
... graduated , but each division contains 10 ° , and the numbers proceed from the north and south points to 90 ° on each side , thus dividing the inner circle into four quadrants of 90 ° each . On a finely pointed pin fixed in the centre ...
Page 30
... graduated circle , and the needle should be straight . If this is not the case , there will be an error of eccen- tricity in every observation . The constant eccentricity , when the centre pin and the ends of the needle are not in one ...
... graduated circle , and the needle should be straight . If this is not the case , there will be an error of eccen- tricity in every observation . The constant eccentricity , when the centre pin and the ends of the needle are not in one ...
Page 32
... graduated card of the mariner's compass is marked accordingly . In the miner's dial , however , the letters representing east and west are transposed . The reason of this will be seen from Fig . 11 . Here the dial is represented with ...
... graduated card of the mariner's compass is marked accordingly . In the miner's dial , however , the letters representing east and west are transposed . The reason of this will be seen from Fig . 11 . Here the dial is represented with ...
Page 33
... graduated to 45 ° on each side of a zero - point , a pin being fixed on the edge directly opposite that point . The ... graduation of the cover being at its lower edge . A plumb - line was then suspended from the pin in the upper edge of ...
... graduated to 45 ° on each side of a zero - point , a pin being fixed on the edge directly opposite that point . The ... graduation of the cover being at its lower edge . A plumb - line was then suspended from the pin in the upper edge of ...
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Common terms and phrases
accuracy accurate adjusted base-line bearing bore-hole brass calculated centre chain City Guilds clamped clinometer coal colliery collimation compass compass-box contour lines cord corner cosec cotan cross-wires curve determined direction distance divided divisions 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 meridian angle 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 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
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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