## A Manual for Practical Surveyors |

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A Manual for Practical Surveyors: Containing Methods Indispensably Necessary ... E. W. Beans No preview available - 2016 |

### Common terms and phrases

adjusted angles of deflection angular point applied attached bearing beginning calculations centre chains clamp the lower closing line corner correction correctly course determine difference direction distance divided equal error Example feet former given gives ground hand horizontal instrument kerfs laid land length let the needle line A B lower plate magnetic marks means measure method minutes move nearly needle nonius compass 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 side staff stake subtracted sure survey surveyor taken tance tang tangents tion transit triangle tripod true line variation vernier

### 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.