A Treatise on Mine-surveying |
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Page xii
... Scales , • CHAPTER XI . PLOTTING THE SURVEY . 1. Simply divided scales ,. 2. Diagonal scales , 3. Vernier scales , . Plotting scales , Plotting with a protractor , Plotting by means of chords , Plotting by rectangular co - ordinates ...
... Scales , • CHAPTER XI . PLOTTING THE SURVEY . 1. Simply divided scales ,. 2. Diagonal scales , 3. Vernier scales , . Plotting scales , Plotting with a protractor , Plotting by means of chords , Plotting by rectangular co - ordinates ...
Page xv
... scale and conventional sigus , Preservation of plans , . Practical hints for constructing mine plans , Copying plans ,. ( 1. ) Copying by tracing , ( 2. ) Copying on tracing paper , ( 3. ) Pricking through , ( 4. ) Copying by ...
... scale and conventional sigus , Preservation of plans , . Practical hints for constructing mine plans , Copying plans ,. ( 1. ) Copying by tracing , ( 2. ) Copying on tracing paper , ( 3. ) Pricking through , ( 4. ) Copying by ...
Page 44
... scale by placing perforated metal plates in the roofs of high buildings , a notable example being in the dome of the cathedral at Florence ( 1467 , a.d. ) The shadow method may be applied on a small scale by employing a vertical pin ...
... scale by placing perforated metal plates in the roofs of high buildings , a notable example being in the dome of the cathedral at Florence ( 1467 , a.d. ) The shadow method may be applied on a small scale by employing a vertical pin ...
Page 48
... scale map may be employed . The direction of the meridian is shown by joining the degrees of longitude marked at the top and bottom of the map . The angle formed by the meridian and some line easy to determine on the ground , is ...
... scale map may be employed . The direction of the meridian is shown by joining the degrees of longitude marked at the top and bottom of the map . The angle formed by the meridian and some line easy to determine on the ground , is ...
Page 58
... scale has to be x n X made to coincide with one on the other scale , and the space between the two corresponding ath divisions from the coinciding divisions , on both scales will be the required length of unit . n of a The same ...
... scale has to be x n X made to coincide with one on the other scale , and the space between the two corresponding ath divisions from the coinciding divisions , on both scales will be the required length of unit . n of a The same ...
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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
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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.
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