A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Results 1-5 of 8
Page 34
... corner by 1.23 perches . What perpendicular offsets must be laid off from this random line , that stakes may be set at every 10 perches from the beginning of the line . Reckoning from the beginning the several dis- tances will be .08 ...
... corner by 1.23 perches . What perpendicular offsets must be laid off from this random line , that stakes may be set at every 10 perches from the beginning of the line . Reckoning from the beginning the several dis- tances will be .08 ...
Page 36
... corner being to the right of the random line 12.1 feet . First . - As 242 : 2 :: 12.1 : .1 correction for 2p . From 12.1 take .1 the remainder 12 being divided by 6 , the number of stakes in the line , gives 2 feet , the difference of ...
... corner being to the right of the random line 12.1 feet . First . - As 242 : 2 :: 12.1 : .1 correction for 2p . From 12.1 take .1 the remainder 12 being divided by 6 , the number of stakes in the line , gives 2 feet , the difference of ...
Page 39
... corner ; then , As the length of the line run , Is to the said perpendicular distance , So is 57.3 degrees , or 3438 minutes , To the difference of variation or correction of the course , Which , being applied to the given bearing ...
... corner ; then , As the length of the line run , Is to the said perpendicular distance , So is 57.3 degrees , or 3438 minutes , To the difference of variation or correction of the course , Which , being applied to the given bearing ...
Page 40
... corner : what is the present bearing of the line . By the first rule : As 170 : 1.55 :: 3438 ' 31 ' correction . By the second method : : As 255 : 1.55 : : 86 ° : 31 ' . By the third : 1.55 ÷ 170 = .00912 , tang . of 31 ′ . Hence 40 ...
... corner : what is the present bearing of the line . By the first rule : As 170 : 1.55 :: 3438 ' 31 ' correction . By the second method : : As 255 : 1.55 : : 86 ° : 31 ' . By the third : 1.55 ÷ 170 = .00912 , tang . of 31 ′ . Hence 40 ...
Page 42
... corner 4.5 perches to the right hand , what is the present bearing of the line ? Ans . N. 23 ° 7 ' E. Example 8th . - A line being run by a former course S. 12 ° 19 ' E. 128.7 perches , the corner was found 2.3 perches to the right ...
... corner 4.5 perches to the right hand , what is the present bearing of the line ? Ans . N. 23 ° 7 ' E. Example 8th . - A line being run by a former course S. 12 ° 19 ' E. 128.7 perches , the corner was found 2.3 perches to the right ...
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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.