A Manual for Practical Surveyors
J. W. Moore, 1854 - Surveying - 108 pages
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Common terms and phrases
adjusted angles of deflection angular point applied attached attraction bearing beginning calculations centre chains closing line column correction correctly course determine difference direction distance divided equal error Example feet former given gives ground hand horizontal instrument laid land length line A B lower plate magnetic manner marks means measure method minutes move nearly needle object observation obstacles obtain offset opposite parallel perches perpendicular plate position practice preceding present bearing prolong PROPOSITION random line remove reverse right angles right line rule run a line run the line screw side staff stake subtracted sufficiently sure survey surveyor taken tance tang tangents tion transit triangle tripod true line variation vernier
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.