A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 12
... calculating the tangents of the angles , to a radius , equal to the distance of the sights apart , and setting off those distances , on the sight . This may be carried to about 20 ° . The links to be deducted , for every chain length ...
... calculating the tangents of the angles , to a radius , equal to the distance of the sights apart , and setting off those distances , on the sight . This may be carried to about 20 ° . The links to be deducted , for every chain length ...
Page 20
... to facili- tate many calculations necessary to be made in the field . Scribner's Engineer's Pocket Table Book may be particularly recommended . He should also have a reading - glass of considerable power , 20 A MANUAL FOR SURVEYORS .
... to facili- tate many calculations necessary to be made in the field . Scribner's Engineer's Pocket Table Book may be particularly recommended . He should also have a reading - glass of considerable power , 20 A MANUAL FOR SURVEYORS .
Page 35
... calculations , we must find the offset corresponding to the distance from the last stake to the end of the line , which being applied to the offset at the last stake in the random line will , if all the calculations are correct , make ...
... calculations , we must find the offset corresponding to the distance from the last stake to the end of the line , which being applied to the offset at the last stake in the random line will , if all the calculations are correct , make ...
Page 37
... calculation made by the former method is as follows : As 242 : 40 :: 12.1 : 2. the correction from stake to stake . Correction at the 1st stake , 2 . 66 2d 66 4 . ( 6 3d 6 . 66 4th " 8 . ( 6 5th " 10 . 66 6th " 12 . 66 for 2 per . .1 66 ...
... calculation made by the former method is as follows : As 242 : 40 :: 12.1 : 2. the correction from stake to stake . Correction at the 1st stake , 2 . 66 2d 66 4 . ( 6 3d 6 . 66 4th " 8 . ( 6 5th " 10 . 66 6th " 12 . 66 for 2 per . .1 66 ...
Page 79
... calculations are made by J. Gummere's rule , ( the sides A D and B C , as in the above ex- ample , being nearly parallel , ) great care must be used in extending the decimals to 3 places to en- sure accuracy , as two decimals only may ...
... calculations are made by J. Gummere's rule , ( the sides A D and B C , as in the above ex- ample , being nearly parallel , ) great care must be used in extending the decimals to 3 places to en- sure accuracy , as two decimals only may ...
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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.