A Treatise on Mine-surveying |
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Page 22
... turned by the other . Two brass handles , which can be detached , accompany the tape , and are carried upon the reel . The advantages of the tape are ( 1 ) the greater facility in measuring up and down slopes , or along the face of the ...
... turned by the other . Two brass handles , which can be detached , accompany the tape , and are carried upon the reel . The advantages of the tape are ( 1 ) the greater facility in measuring up and down slopes , or along the face of the ...
Page 33
... turning the instrument , by means of its ball and socket joint , until it was in a plane at right angles to its proper position for taking horizon- tal angles , the graduation of the cover being at its lower edge . A plumb - line was ...
... turning the instrument , by means of its ball and socket joint , until it was in a plane at right angles to its proper position for taking horizon- tal angles , the graduation of the cover being at its lower edge . A plumb - line was ...
Page 35
... levelled , the sights were turned in the direction of the shaft . An assistant having by this time placed a staff at the FIELD RECORD OF SURVEY . A 512 6 460 10 THE MINER'S DIAL . 35 (2 ) Surface-surveys with the miner's dial,
... levelled , the sights were turned in the direction of the shaft . An assistant having by this time placed a staff at the FIELD RECORD OF SURVEY . A 512 6 460 10 THE MINER'S DIAL . 35 (2 ) Surface-surveys with the miner's dial,
Page 36
... ' 9 с 450 8 340 17 260 31 200 35 3 . 100 23 285 ° 18 ' O : 7 B 496 12 18 400 35 290 24 270 27 2 . 200 15 30 ° 00 ' 630 OA 1 . Shaft to A 13 ° 33 ' centre of the shaft , the sights were turned until 36 MINE SURVEYING .
... ' 9 с 450 8 340 17 260 31 200 35 3 . 100 23 285 ° 18 ' O : 7 B 496 12 18 400 35 290 24 270 27 2 . 200 15 30 ° 00 ' 630 OA 1 . Shaft to A 13 ° 33 ' centre of the shaft , the sights were turned until 36 MINE SURVEYING .
Page 37
Bennett H. Brough. centre of the shaft , the sights were turned until the vertical hair of the back - sight exactly ... turning the instrument until the vertical hair of the fore - sight exactly cut the staff . The needle was then read ...
Bennett H. Brough. centre of the shaft , the sights were turned until the vertical hair of the back - sight exactly ... turning the instrument until the vertical hair of the fore - sight exactly cut the staff . The needle was then read ...
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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.
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Page 23 - AE A Manual of Marine Engineering. Comprising the Designing, Construction and Working of Marine Machinery.
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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.