A Treatise on Mine-surveying |
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Page 32
... east point is on our right hand , and the west on our left , and the graduated card of the mariner's compass is marked accordingly . In the miner's dial , however , the letters representing east and west are transposed . Fig . 11 . The ...
... east point is on our right hand , and the west on our left , and the graduated card of the mariner's compass is marked accordingly . In the miner's dial , however , the letters representing east and west are transposed . Fig . 11 . The ...
Page 39
... 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 that date , the variation has been westerly ...
... 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 that date , the variation has been westerly ...
Page 41
... east of South America , and , passing east of the West Indies , crosses the United States , passing just east of Charleston , South Carolina , and just west of Detroit , Michigan . It then passes through the North Pole , crosses Lapland ...
... east of South America , and , passing east of the West Indies , crosses the United States , passing just east of Charleston , South Carolina , and just west of Detroit , Michigan . It then passes through the North Pole , crosses Lapland ...
Page 42
... 0.50 -1.15 In this table deflections towards the magnetic east are reckoned positive , deflections towards magnetic west negative . hemisphere ) , the second is an equatorial station , 42 DIURNAL VARIATION . 0 Definitions,
... 0.50 -1.15 In this table deflections towards the magnetic east are reckoned positive , deflections towards magnetic west negative . hemisphere ) , the second is an equatorial station , 42 DIURNAL VARIATION . 0 Definitions,
Page 43
... east of the disturbed regions have practically no dis- turbance . Atmospheric storms have no effect on the needle . Notices of the occurrence of magnetic storms are published by the Superintendent of the Magnetic Department at Greenwich ...
... east of the disturbed regions have practically no dis- turbance . Atmospheric storms have no effect on the needle . Notices of the occurrence of magnetic storms are published by the Superintendent of the Magnetic Department at Greenwich ...
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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.