A Treatise on Mine-surveying |
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Results 1-5 of 41
Page 2
... glass cylinders at each end of the beam . The cylinders had special covers made of metal plate , which could be raised or lowered by means of screws . They were furnished with vertical and horizontal slits for sighting . The instrument ...
... glass cylinders at each end of the beam . The cylinders had special covers made of metal plate , which could be raised or lowered by means of screws . They were furnished with vertical and horizontal slits for sighting . The instrument ...
Page 21
... glass rods were substituted for wood in the measurement of the Hounslow base in 1784. Their ends were protected with metal caps . The results obtained were perfectly satisfactory , measure- ments with the glass rods and a check ...
... glass rods were substituted for wood in the measurement of the Hounslow base in 1784. Their ends were protected with metal caps . The results obtained were perfectly satisfactory , measure- ments with the glass rods and a check ...
Page 26
... glass , and liquids as instantaneously and with as great intensity as through the air . Historical Sketch . - To Flavio Gioja ( 1302-1320 ) is usually assigned the credit of having first enclosed a magnetic - needle in a box . The use ...
... glass , and liquids as instantaneously and with as great intensity as through the air . Historical Sketch . - To Flavio Gioja ( 1302-1320 ) is usually assigned the credit of having first enclosed a magnetic - needle in a box . The use ...
Page 28
... glass , and a cover suitable to it hung square and level with the upper part of the instrument : a twenty - four inch gauge or two - foot rule , and a string or small cord with a plummet at the end of it : a little stool , to place the ...
... glass , and a cover suitable to it hung square and level with the upper part of the instrument : a twenty - four inch gauge or two - foot rule , and a string or small cord with a plummet at the end of it : a little stool , to place the ...
Page 29
... glass lid of the dial . When required to be used , the needle should be lowered carefully , so that it gently rests and does not fall upon the centre pin . · A Much depends upon the sensitiveness of the needle . sluggish needle is ...
... glass lid of the dial . When required to be used , the needle should be lowered carefully , so that it gently rests and does not fall upon the centre pin . · A Much depends upon the sensitiveness of the needle . sluggish needle is ...
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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.