A Treatise on Mine-surveying |
From inside the book
Results 1-5 of 46
Page 11
... square chains being equal to 1 acre . The chain is composed of 100 links of iron or steel wire , each bent at the end into a ring , and connected with the ring at the end of the next piece by means of three rings . The chain is thus ...
... square chains being equal to 1 acre . The chain is composed of 100 links of iron or steel wire , each bent at the end into a ring , and connected with the ring at the end of the next piece by means of three rings . The chain is thus ...
Page 12
... Square and Guildhall , for the use of surveyors in London . For rough colliery surveys , the chain may be left half - an - inch longer than the true length , since it is rarely stretched perfectly horizontally , or drawn out into a ...
... Square and Guildhall , for the use of surveyors in London . For rough colliery surveys , the chain may be left half - an - inch longer than the true length , since it is rarely stretched perfectly horizontally , or drawn out into a ...
Page 15
... square , recommended by some surveyors for erecting perpendicular lines , are rarely necessary in mine - surveying practice . The optical square consists of two small mirrors placed in a brass box at an angle of 45 ° , thus reflecting ...
... square , recommended by some surveyors for erecting perpendicular lines , are rarely necessary in mine - surveying practice . The optical square consists of two small mirrors placed in a brass box at an angle of 45 ° , thus reflecting ...
Page 21
... square . ( b . ) Rods . — When very accurate measurements were required , deal rods were at one time largely used instead of the chain for measuring long lines . They were , however , soon discarded in exact operations , as experience ...
... square . ( b . ) Rods . — When very accurate measurements were required , deal rods were at one time largely used instead of the chain for measuring long lines . They were , however , soon discarded in exact operations , as experience ...
Page 24
... square root of the length , according to the theory of probabilities . The mean error m in measuring a line L by five different methods is as follows : - Two rods along a stretched cord , Two rods , without cord , Chain , Steel band ...
... square root of the length , according to the theory of probabilities . The mean error m in measuring a line L by five different methods is as follows : - Two rods along a stretched cord , Two rods , without cord , Chain , Steel band ...
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Common terms and phrases
accuracy accurate adjusted base-line bearing bore-hole brass calculated centre chain City Guilds clamped clinometer coal colliery collimation compass compass-box contour lines cord corner cosec cotan cross-wires curve determined direction distance divided divisions 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 meridian angle 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 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
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.