A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field OperationsJ. W. Moore, 1854 - 108 pagina's |
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A Manual for Practical Surveyors: Containing Methods Indispensably Necessary ... E. W. Beans Volledige weergave - 1854 |
A Manual for Practical Surveyors: Containing Methods Indispensably Necessary ... E. W. Beans Volledige weergave - 1854 |
Veelvoorkomende woorden en zinsdelen
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
Populaire passages
Pagina 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.
Pagina 17 - ... more than half through its thickness, and intersecting each other at right angles at the centre of the block...
Pagina 58 - A line which is to be established from the course only, should be re-run at nearly the same season...
Pagina 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.
Pagina 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.