A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 33
... 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 leaving stakes at every 20 perches distance from ...
... 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 leaving stakes at every 20 perches distance from ...
Page 35
... example : -say as 647 : 7 :: 47.3 : 5 , which , added to the 16th 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 ...
... example : -say as 647 : 7 :: 47.3 : 5 , which , added to the 16th 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 ...
Page 40
... Example 6th . Suppose a line some years ago bore N 40 ° W 170 per . , and that in running by this course , we came out 1.55 per . to the left hand of the true corner : what is the present bearing of the line . By the first rule : As 170 ...
... Example 6th . Suppose a line some years ago bore N 40 ° W 170 per . , and that in running by this course , we came out 1.55 per . to the left hand of the true corner : what is the present bearing of the line . By the first rule : As 170 ...
Page 42
... Example 7th . - In running a line which , some years ago , bore N. 22 ° 17 ′ E. 311.7 perches , I found the true corner 4.5 perches to the right hand , what is the present bearing of the line ? Ans . N. 23 ° 7 ' E. Example 8th . - A ...
... Example 7th . - In running a line which , some years ago , bore N. 22 ° 17 ′ E. 311.7 perches , I found the true corner 4.5 perches to the right hand , what is the present bearing of the line ? Ans . N. 23 ° 7 ' E. Example 8th . - A ...
Page 44
... A C , the corrections n1 m1 , n2 m2 , & c . , must be subtracted from A C to obtain the corrections for the points p1 p2 , & c . , in the line A B. Example 1st . Being required to run a line be- 44 A MANUAL FOR SURVEYORS .
... A C , the corrections n1 m1 , n2 m2 , & c . , must be subtracted from A C to obtain the corrections for the points p1 p2 , & c . , in the line A B. Example 1st . Being required to run a line be- 44 A MANUAL FOR SURVEYORS .
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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.