A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 33
... offsets are some multiple of the first . 1. As an example , suppose it is required to run a line between two farms having a stone at which to commence , and also another to which to run . Hav- ing run the random line as directed , and ...
... offsets are some multiple of the first . 1. As an example , suppose it is required to run a line between two farms having a stone at which to commence , and also another to which to run . Hav- ing run the random line as directed , and ...
Page 34
... offset at 96 per . These distances being severally laid off from the random line , to the right or left , according ... offsets must be laid off from this random line , that stakes may be set at every 10 perches from the beginning of the ...
... offset at 96 per . These distances being severally laid off from the random line , to the right or left , according ... offsets must be laid off from this random line , that stakes may be set at every 10 perches from the beginning of the ...
Page 35
... offset 46.8 , gives 47.3 ft . The following method of finding the offsets may sometimes be used instead of the preceding , or may be used to verify their correctness . Find the proportional part of the offset for the distance of the ...
... offset 46.8 , gives 47.3 ft . The following method of finding the offsets may sometimes be used instead of the preceding , or may be used to verify their correctness . Find the proportional part of the offset for the distance of the ...
Page 36
... offsets at each succeeding stake . Offset at the end of the line , 12.1 ft . 66 to be deducted for 2 per . .1 66 at the 6th stake , 12.0 difference of offsets , 2 . 46 at the 5th stake , 10 . 2 . 66 4th 66 8 . 2 . 66 3d 66 6 . 2 . 66 2d ...
... offsets at each succeeding stake . Offset at the end of the line , 12.1 ft . 66 to be deducted for 2 per . .1 66 at the 6th stake , 12.0 difference of offsets , 2 . 46 at the 5th stake , 10 . 2 . 66 4th 66 8 . 2 . 66 3d 66 6 . 2 . 66 2d ...
Page 37
... 66 4th " 8 . ( 6 5th " 10 . 66 6th " 12 . 66 for 2 per . .1 66 for 242 12.1 It will be sufficiently exact in many cases to omit the fractions of a perch in the first and 4 * A MANUAL FOR SURVEYORS . 37 Offset at the 2d stake, ...
... 66 4th " 8 . ( 6 5th " 10 . 66 6th " 12 . 66 for 2 per . .1 66 for 242 12.1 It will be sufficiently exact in many cases to omit the fractions of a perch in the first and 4 * A MANUAL FOR SURVEYORS . 37 Offset at the 2d stake, ...
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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.