A Treatise on Mine-surveying |
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Page 19
... centre of the page . In this are set down the distances on the station - line at which any offset is made , and on the right and left of the column are entered the offsets and observations made on those sides respectively of the station ...
... centre of the page . In this are set down the distances on the station - line at which any offset is made , and on the right and left of the column are entered the offsets and observations made on those sides respectively of the station ...
Page 21
... centre , it having been found by numerous experiments that they expanded or con- tracted in the proportion of 3 to 5. The brass bar was coated with some non - conducting substance , in order to equalise the susceptibility of the two ...
... centre , it having been found by numerous experiments that they expanded or con- tracted in the proportion of 3 to 5. The brass bar was coated with some non - conducting substance , in order to equalise the susceptibility of the two ...
Page 26
... centre of gravity , it assumes a certain direction ; one pole pointing towards the north and the other towards the south . The pole of the needle directed towards the north is called the north pole or , more correctly , the north ...
... centre of gravity , it assumes a certain direction ; one pole pointing towards the north and the other towards the south . The pole of the needle directed towards the north is called the north pole or , more correctly , the north ...
Page 28
... centre of the circle , a magnetic - needle is freely suspended , so that when the dial is placed in a horizontal position and the needle unchecked , one end points towards the north . This north - seeking end is distinguished by some ...
... centre of the circle , a magnetic - needle is freely suspended , so that when the dial is placed in a horizontal position and the needle unchecked , one end points towards the north . This north - seeking end is distinguished by some ...
Page 29
... centre , and carries above the aperture a hollow brass cap , lined with some hard stone conically hollowed out . Agate or carnelian is usually employed for the purpose ; but ruby is best . The cap must be as light as possible , and it ...
... centre , and carries above the aperture a hollow brass cap , lined with some hard stone conically hollowed out . Agate or carnelian is usually employed for the purpose ; but ruby is best . The cap must be as light as possible , and it ...
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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.