A Treatise on Mine-surveying |
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Page 29
... axis forms a right angle with the axis of the needle . The interior of the cap must be accurately conical . Caps made of brass , silver , or steel should be avoided , as they cannot be polished so well as those of agate , and they are ...
... axis forms a right angle with the axis of the needle . The interior of the cap must be accurately conical . Caps made of brass , silver , or steel should be avoided , as they cannot be polished so well as those of agate , and they are ...
Page 43
... shadows are joined when they are of equal length . On joining these points to the projection of the axis of the THE VARIATION OF THE MAGNETIC - NEEDLE . 43 Irregular variations, Determination of the true meridian, Method of shadows, B=***
... shadows are joined when they are of equal length . On joining these points to the projection of the axis of the THE VARIATION OF THE MAGNETIC - NEEDLE . 43 Irregular variations, Determination of the true meridian, Method of shadows, B=***
Page 44
Bennett H. Brough. these points to the projection of the axis of the staff , an angle is obtained , the bisectrix of which is the true meridian . The obser- vation may be made more accurately by describing a number of concentric circles ...
Bennett H. Brough. these points to the projection of the axis of the staff , an angle is obtained , the bisectrix of which is the true meridian . The obser- vation may be made more accurately by describing a number of concentric circles ...
Page 45
... axis of the telescope will give the direction of the meridian . The method is based upon the fact that a star at equal altitudes above the horizon of a place is equally distant from the plane of its meridian . It is evident that the ...
... axis of the telescope will give the direction of the meridian . The method is based upon the fact that a star at equal altitudes above the horizon of a place is equally distant from the plane of its meridian . It is evident that the ...
Page 49
... axis . To avoid as much as possible the action of frost , it is advisable to give the stone a good foundation and to fix it in cement . On the top of the stone a brass plate , a foot square , is fastened , so that it is exactly ...
... axis . To avoid as much as possible the action of frost , it is advisable to give the stone a good foundation and to fix it in cement . On the top of the stone a brass plate , a foot square , is fastened , so that it is exactly ...
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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.