A Treatise on Mine-surveying |
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Page x
... meridian by means of the Pole star , 4. Determination of the meridian by means of a map , 47 48 Setting out the meridian line , 48 Inclination of the magnetic - needle , 49 CHAPTER V. SURVEYING WITH THE MAGNETIC - NEEDLE IN THE PRESENCE ...
... meridian by means of the Pole star , 4. Determination of the meridian by means of a map , 47 48 Setting out the meridian line , 48 Inclination of the magnetic - needle , 49 CHAPTER V. SURVEYING WITH THE MAGNETIC - NEEDLE IN THE PRESENCE ...
Page 5
... meridian by the direction of a horizontal line drawn in the middle plane . Its dip is the inclination downwards measured in degrees from the horizontal . As the dip of veins is usually great , it is somtimes measured from the vertical ...
... meridian by the direction of a horizontal line drawn in the middle plane . Its dip is the inclination downwards measured in degrees from the horizontal . As the dip of veins is usually great , it is somtimes measured from the vertical ...
Page 7
... meridian was taken as the standard . For this pur- pose , at the time of the French Revolution , the distance from Dunkirk to Barcelona was determined . Both these places are in the same meridian as Paris . The measurement was ...
... meridian was taken as the standard . For this pur- pose , at the time of the French Revolution , the distance from Dunkirk to Barcelona was determined . Both these places are in the same meridian as Paris . The measurement was ...
Page 32
... meridian , forming with it an angle of 24 ° In order to prevent confusion , miner's dials are , as a rule , graduated from right to left , the east and west points being trans- posed . An illustration of the necessity of this change may ...
... meridian , forming with it an angle of 24 ° In order to prevent confusion , miner's dials are , as a rule , graduated from right to left , the east and west points being trans- posed . An illustration of the necessity of this change may ...
Page 39
... meridian veered 4 ° 30 ′ further towards the east . From 1580 the declination decreased , the magnetic meridian moving towards the west , until in 1666 there was no variation ; the magnetic and true meridians coinciding . Ever since ...
... meridian veered 4 ° 30 ′ further towards the east . From 1580 the declination decreased , the magnetic meridian moving towards the west , until in 1666 there was no variation ; the magnetic and true meridians coinciding . Ever since ...
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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.
Page 20 - With appendix, tables, tests, and formulae for the use of Electrical Engineers. Comprising Submarine Electrical Engineering, Electric Lighting, and Transmission of Power. By Andrew Jamieson, CE, FRSE Seventh edition.
Page 23 - SHELTON-BEY (W. Vincent, Foreman to the Imperial Ottoman Gun Factories, Constantinople) : THE MECHANIC'S GUIDE : A Hand-Book for Engineers and Artizans. With Copious Tables and Valuable Recipes for Practical Use. Illustrated. Second Edition. Crown 8vo. Cloth, 7/6.
Page 21 - No more enduring Memorial of Professor Rankine could be devised than the publication of these papers in an accessible form. . . . The Collection is most valuable pa account of the nature of his discoveries, and the beauty and completeness of his analysis.
Page 23 - AE A Manual of Marine Engineering. Comprising the Designing, Construction and Working of Marine Machinery.
Page 21 - In order to render the work complete for the purposes of the Shipbuilder, whether at home or abroad, the Methods of Calculation introduced by Mr. FK BARNES. Mr. GRAY, M.
Page 33 - GRAY'S (Thomas) POETICAL WORKS. With Life by the Rev. JOHN MITFORD, and Essay by the EARL of CARLISLE. With Portrait and numerous Engravings on Steel and Wood. Elegantly printed on toned paper.