Tacheometer Surveying with Special Notes on Plotting, Care and Adjustment of Instruments, Field Work, and Calculations |
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Page 5
... marked on its diaphragm , but the telescope of such an instrument is usually of low power , and this unduly restricts the working range . Working Range of Tacheometers . Experience has shown that , owing to difficulties con- nected with ...
... marked on its diaphragm , but the telescope of such an instrument is usually of low power , and this unduly restricts the working range . Working Range of Tacheometers . Experience has shown that , owing to difficulties con- nected with ...
Page 8
... marked 9 will coincide with a division on the scale . Hence , in order to ascertain the exact number of vernier ... marked against that vernier division . With such a device , the scale being graduated to single centimetres only , th of ...
... marked 9 will coincide with a division on the scale . Hence , in order to ascertain the exact number of vernier ... marked against that vernier division . With such a device , the scale being graduated to single centimetres only , th of ...
Page 10
... marked on the vernier against this division gives the number of odd minutes to be added to the whole degrees ( and possibly a half - degree ) . A vernier made to read single minutes will usually be numbered at each 10 minutes of its ...
... marked on the vernier against this division gives the number of odd minutes to be added to the whole degrees ( and possibly a half - degree ) . A vernier made to read single minutes will usually be numbered at each 10 minutes of its ...
Page 11
... marked on the ( horizontal ) scale contains two subdivisions ( each of 30 ′ ) , and there are sixty divisions on the vernier , it will read to : - 30 ' 60 ' minute , or 30 ′′ . Its length will be equal to ( 60-1 ) half - degrees , or ...
... marked on the ( horizontal ) scale contains two subdivisions ( each of 30 ′ ) , and there are sixty divisions on the vernier , it will read to : - 30 ' 60 ' minute , or 30 ′′ . Its length will be equal to ( 60-1 ) half - degrees , or ...
Page 15
... marked A when the level - bubbles were adjusted , it is best to work with it over the same vernier , as changing it to the other side may throw the bubbles slightly out of truth . ( See Chapter VIII . ) The next step is to place the ...
... marked A when the level - bubbles were adjusted , it is best to work with it over the same vernier , as changing it to the other side may throw the bubbles slightly out of truth . ( See Chapter VIII . ) The next step is to place the ...
Other editions - View all
Tacheometer Surveying with Special Notes on Plotting, Care and Adjustment of ... Mark Erskine Yorke Eliot No preview available - 2016 |
Tacheometer Surveying with Special Notes on Plotting, Care and Adjustment of ... Mark Erskine Yorke Eliot No preview available - 2016 |
Common terms and phrases
accuracy adjustment Bearing and Distance Calculation centimetre Centre wire reading clamp Closing Error collimation level column contour line correct cos² crown 8vo decimal demy 8vo diagram direction division Electric Engineers exactly fall of line fcap feet field book field notes figures folding plates footscrews graduated Handbook height illus instrument collimation leather length line of sight Log diff logarithms lower axis marked measured meridian method minus minutes of arc N. H. Schneider Observed Distance obtained parallel ruler Planimeter plotting position Practical protractor R.L. of instrument R.L. of line Railway reading on staff reduced level Rise or fall scale Second edition sewed sight at staff slide slide-rule spot-levels square starting-point station points survey tacheometer tangent screw telescope bubble theodolite Third edition transit axis traverse lines vernier scale vernier zero vertical angle vertical arc vertical circle York zero line
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