A Treatise on Mine-surveying |
From inside the book
Results 1-5 of 34
Page 11
... construction of iron chains is usually No. 8 W.G .; that used for steel chains is No. 12 , or No. 8 W.G. The hundredth part of the chain is called a link , and is equal to 0.66 foot or 7.92 inches . All calculations with chains and ...
... construction of iron chains is usually No. 8 W.G .; that used for steel chains is No. 12 , or No. 8 W.G. The hundredth part of the chain is called a link , and is equal to 0.66 foot or 7.92 inches . All calculations with chains and ...
Page 49
... construction of the instruments , the bearing of one and the same line is found to vary when determined with different dials . By observing the line of orientation , the error of each dial may be determined , and applied as a constant ...
... construction of the instruments , the bearing of one and the same line is found to vary when determined with different dials . By observing the line of orientation , the error of each dial may be determined , and applied as a constant ...
Page 61
... construction of the sights , the use of horse hairs is avoided , as they are continually getting burnt by a flaring candle underground . In place of the ordinary horse - hair sights , the split - sight is adopted . There is a narrow ...
... construction of the sights , the use of horse hairs is avoided , as they are continually getting burnt by a flaring candle underground . In place of the ordinary horse - hair sights , the split - sight is adopted . There is a narrow ...
Page 78
... construction . In the Harz mines , instead of the cord , a thin brass chain is used . It is 10 metres in length , and is provided with a hook at one end . Every metre is indicated by a brass tag . The chain is wound on a reel , and used ...
... construction . In the Harz mines , instead of the cord , a thin brass chain is used . It is 10 metres in length , and is provided with a hook at one end . Every metre is indicated by a brass tag . The chain is wound on a reel , and used ...
Page 79
... construction . If the cord is in- clined at an angle B A C ( Fig . 27 ) , the hair will not coincide with zero , but will give the angle DHE , which represents the angle of in- clination of the cord . For since AHD + DHE = a right angle ...
... construction . If the cord is in- clined at an angle B A C ( Fig . 27 ) , the hair will not coincide with zero , but will give the angle DHE , which represents the angle of in- clination of the cord . For since AHD + DHE = a right angle ...
Contents
153 | |
169 | |
170 | |
184 | |
204 | |
210 | |
217 | |
222 | |
60 | |
66 | |
74 | |
80 | |
87 | |
94 | |
103 | |
111 | |
119 | |
126 | |
132 | |
138 | |
147 | |
228 | |
232 | |
234 | |
237 | |
246 | |
252 | |
258 | |
265 | |
276 | |
283 | |
294 | |
295 | |
Other editions - View all
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.