A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 10
... feet frame for measuring distances accurately . The two pole chain is commonly used . It should be made of heavy wire , the links con- nected by double rings to prevent the chain kink- ing , it should be firm in all its parts , and of ...
... feet frame for measuring distances accurately . The two pole chain is commonly used . It should be made of heavy wire , the links con- nected by double rings to prevent the chain kink- ing , it should be firm in all its parts , and of ...
Page 34
... feet from the point at which the line in question must end , the stakes in the random line being set at every 40 perches . Result , 1st dist . 2.9 ; 2d , 5.8 ; 3d , 8.8 ; 4th , 11.7 ; 5th , 14.6 ; 6th , 17.5 ; 7th , 20.5 ; 8th , 23.4 ...
... feet from the point at which the line in question must end , the stakes in the random line being set at every 40 perches . Result , 1st dist . 2.9 ; 2d , 5.8 ; 3d , 8.8 ; 4th , 11.7 ; 5th , 14.6 ; 6th , 17.5 ; 7th , 20.5 ; 8th , 23.4 ...
Page 35
... feet . In general it will be most convenient to set the stakes in the true line in a retrograde order , begin- ning with the last stake in the random line , and returning to the first . To ensure accuracy in our calculations , we must ...
... feet . In general it will be most convenient to set the stakes in the true line in a retrograde order , begin- ning with the last stake in the random line , and returning to the first . To ensure accuracy in our calculations , we must ...
Page 36
... 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 the offsets at each succeeding stake . Offset at ...
... 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 the offsets at each succeeding stake . Offset at ...
Page 41
... feet offset by 208 , and divide the product by the length of the line in per- ches , the result will be the correction in minutes . Rule 5th . Multiply the feet offset by 100 , and divide the length of the line in 2 pole chains ; to the ...
... feet offset by 208 , and divide the product by the length of the line in per- ches , the result will be the correction in minutes . Rule 5th . Multiply the feet offset by 100 , and divide the length of the line in 2 pole chains ; to the ...
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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.