A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 11
... nearly so , as errors may in the measured distances , ) it is evidence of the correctness of the divisions , needle , & c . , and that the instrument is a good one . Any regular figure may be used for this purpose . A nonius compass be ...
... nearly so , as errors may in the measured distances , ) it is evidence of the correctness of the divisions , needle , & c . , and that the instrument is a good one . Any regular figure may be used for this purpose . A nonius compass be ...
Page 14
... nearly as efficient as a theodolite , in the ordi- nary cases of farm surveying ; and especially where the needle may be rendered almost useless from local attraction , or other accidental occur- rences . A nonius compass may be used ...
... nearly as efficient as a theodolite , in the ordi- nary cases of farm surveying ; and especially where the needle may be rendered almost useless from local attraction , or other accidental occur- rences . A nonius compass may be used ...
Page 16
... off the centre pin ; it will then be very nearly in the magnetic meridian , and will have all the advantages of its remaining on the centre pin , without the danger of blunting it by continual fric- tion 16 A MANUAL FOR SURVEYORS .
... off the centre pin ; it will then be very nearly in the magnetic meridian , and will have all the advantages of its remaining on the centre pin , without the danger of blunting it by continual fric- tion 16 A MANUAL FOR SURVEYORS .
Page 29
... used in this case to run out the line D E F , and the distances A D , B * If C F = A D we may say EF : FD :: ▽ g AB : ▽ h CB the angles being very nearly reciprocally proportional . E , CF , & c . , should be A MANUAL FOR SURVEYORS . 29.
... used in this case to run out the line D E F , and the distances A D , B * If C F = A D we may say EF : FD :: ▽ g AB : ▽ h CB the angles being very nearly reciprocally proportional . E , CF , & c . , should be A MANUAL FOR SURVEYORS . 29.
Page 32
... nearly as can be guessed at , this be- ing the point to which the line is to be run from A , direct stakes to be set at every 20 perches ( or otherwise , as may suit the nature of ground , ) in the di- rection of the sights , which let ...
... nearly as can be guessed at , this be- ing the point to which the line is to be run from A , direct stakes to be set at every 20 perches ( or otherwise , as may suit the nature of ground , ) in the di- rection of the sights , which let ...
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Common terms and phrases
40 perches A E produced angles of deflection angular point back sight bearing of A B bring the sights bring the telescope centre pin circumferenter clamp the lower closing line correction course degrees difference of variation distance A C equal F B G feet Given A B internal angles kerfs last station let the needle line A B line C D line joining lines of survey lower plate magnetic magnetic bearings marked tree n¹ m¹ n³ m³ nier nonius compass nonius plate parallel perpendicular distance Place the instrument present bearing PROPOSITION quired random line right angles right line run a line run the line Set the instrument set the vernier sights to bear subtracted surveyor tance tang telescope to bear tion trapezoid traverse table tripod true bearing true line unclamp vernier to zero
Popular passages
Page 80 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 17 - ... more than half through its thickness, and intersecting each other at right angles at the centre of the block...
Page 58 - A line which is to be established from the course only, should be re-run at nearly the same season...
Page 58 - It must, therefore, be a matter of uncertainty 'whether we have the correct bearing of the line, even when the change for years has been ascertained with the utmost care.
Page 57 - The variation of the magnetic needle in declination, is subject to much irregularity, in some instances increasing, in other decreasing, and some years having scarcely a perceptible motion.