A Treatise on Mine-surveying |
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Results 1-5 of 69
Page ii
... placed in the Printers ' hands , repeated the operation for a third time , on revising the proofs . " - Engineering . SECOND ENLARGED AND REVISED EDITION . In Royal 8vo , with Numerous Illustrations , 36s . ELEMENTS OF METALLURGY : A ...
... placed in the Printers ' hands , repeated the operation for a third time , on revising the proofs . " - Engineering . SECOND ENLARGED AND REVISED EDITION . In Royal 8vo , with Numerous Illustrations , 36s . ELEMENTS OF METALLURGY : A ...
Page 15
... 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 view of the object , whilst the reflected and true object can be exactly superimposed in ...
... 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 view of the object , whilst the reflected and true object can be exactly superimposed in ...
Page 19
... placed that the offsets to be measured from them may be as short and as few in number as practicable . Pickets are placed in the ground at each angle of the triangles , the general form and position of which are noted for reference in a ...
... placed that the offsets to be measured from them may be as short and as few in number as practicable . Pickets are placed in the ground at each angle of the triangles , the general form and position of which are noted for reference in a ...
Page 21
... placed at different distances in order to ascertain the temperature of the chain , so that the base might be reduced ... placed in line very carefully end to end . They are rarely placed directly on the ground , which , as a rule , is ...
... placed at different distances in order to ascertain the temperature of the chain , so that the base might be reduced ... placed in line very carefully end to end . They are rarely placed directly on the ground , which , as a rule , is ...
Page 26
... placed in a circular receptacle in a wooden box , which may be closed by a lid , and which is provided with a hole in its base , probably to enable it to be placed on a stand . The compass has only a north and south line marked , and ...
... placed in a circular receptacle in a wooden box , which may be closed by a lid , and which is provided with a hole in its base , probably to enable it to be placed on a stand . The compass has only a north and south line marked , and ...
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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