A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 10
... chain , measuring - tape , plummet , read- ing - glass , & c . If he intends laying off town lots , he should have a leveling instrument and rod , also a 20 feet frame for measuring distances accurately . The two pole chain is commonly ...
... chain , measuring - tape , plummet , read- ing - glass , & c . If he intends laying off town lots , he should have a leveling instrument and rod , also a 20 feet frame for measuring distances accurately . The two pole chain is commonly ...
Page 12
... the sight . This may be carried to about 20 ° . The links to be deducted , for every chain length oblique measure , to reduce it to horizontal measure , may also be marked on the sights , corresponding with the 12 A MANUAL FOR SURVEYORS .
... the sight . This may be carried to about 20 ° . The links to be deducted , for every chain length oblique measure , to reduce it to horizontal measure , may also be marked on the sights , corresponding with the 12 A MANUAL FOR SURVEYORS .
Page 21
... 3d , & c . 3d . Old residents in the neighborhood , may de- signate marks or points where the original line formerly run . Lastly , the chain and compass . 3 It is the practice where there are ditches along the A MANUAL FOR SURVEYORS . 21.
... 3d , & c . 3d . Old residents in the neighborhood , may de- signate marks or points where the original line formerly run . Lastly , the chain and compass . 3 It is the practice where there are ditches along the A MANUAL FOR SURVEYORS . 21.
Page 41
... chains ; to the quotient add its for the correction in minutes . 25 If a nonius compass be used : Set the nonius 31 ' to the right hand , the needle being set to N 40 ° W , the sights will give the direction of the required line . This ...
... chains ; to the quotient add its for the correction in minutes . 25 If a nonius compass be used : Set the nonius 31 ' to the right hand , the needle being set to N 40 ° W , the sights will give the direction of the required line . This ...
Page 42
... 38 ° 26 ' W. Example 10th . - Wishing to run a line between two points from one of the points I run a course N 89 E , and measured the distance with a two pole chain , 129 chains 36 links , when I 42 A MANUAL FOR SURVEYORS .
... 38 ° 26 ' W. Example 10th . - Wishing to run a line between two points from one of the points I run a course N 89 E , and measured the distance with a two pole chain , 129 chains 36 links , when I 42 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.