A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
From inside the book
Results 1-5 of 44
Page 12
... lines of survey , the same course as formerly , unless the compasses , by which the bearings were taken , differ in other particulars . Another reason for preferring the nonius compass is , that we may run a line to minutes , by setting ...
... lines of survey , the same course as formerly , unless the compasses , by which the bearings were taken , differ in other particulars . Another reason for preferring the nonius compass is , that we may run a line to minutes , by setting ...
Page 21
... line must be run from one marked tree to the next , and thence to the next , and so on . 2d . When there are stones of long standing along the line in question , the line must be run from the first to the second ; from the 2d to the 3d ...
... line must be run from one marked tree to the next , and thence to the next , and so on . 2d . When there are stones of long standing along the line in question , the line must be run from the first to the second ; from the 2d to the 3d ...
Page 22
... the bank of dirt thrown out in digging it , or if the dirt thrown out in digging be on both sides , the middle of the ditch must be taken . PRACTICAL SURVEYING . PROPOSITION 1 . To run a line 22 A MANUAL FOR SURVEYORS .
... the bank of dirt thrown out in digging it , or if the dirt thrown out in digging be on both sides , the middle of the ditch must be taken . PRACTICAL SURVEYING . PROPOSITION 1 . To run a line 22 A MANUAL FOR SURVEYORS .
Page 23
... run a line between two points A and B ; or to trace a right line A B on the ground . Case 1. When the points A and B can | be seen from each other : LA Place the instrument over A , and bring the sights to bear on B ; then direct marks ...
... run a line between two points A and B ; or to trace a right line A B on the ground . Case 1. When the points A and B can | be seen from each other : LA Place the instrument over A , and bring the sights to bear on B ; then direct marks ...
Page 24
... line C D , opposite the points required at n ' , no , & c .; and from these set off perpendicular to C D , and equal to A C or B D , the distances n1 m1 , n2 m2 , & c . , towards A B ... run a right line on the 24 A MANUAL FOR SURVEYORS .
... line C D , opposite the points required at n ' , no , & c .; and from these set off perpendicular to C D , and equal to A C or B D , the distances n1 m1 , n2 m2 , & c . , towards A B ... run a right line on the 24 A MANUAL FOR SURVEYORS .
Other editions - View all
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.