A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 9
... be advisable to visit the shops of the different in- strument makers , and examine the various instru- ments in use . He may be enabled by these means 2 to make a more suitable choice than he would otherwise A MANUAL FOR SURVEYORS. ...
... be advisable to visit the shops of the different in- strument makers , and examine the various instru- ments in use . He may be enabled by these means 2 to make a more suitable choice than he would otherwise A MANUAL FOR SURVEYORS. ...
Page 14
... means of a thumb screw , connecting the arm to the spindle or head of the staff , will point out the num- ber of degrees the compass box may move over , as the motion of the compass is about the immovable spindle of the staff head or ...
... means of a thumb screw , connecting the arm to the spindle or head of the staff , will point out the num- ber of degrees the compass box may move over , as the motion of the compass is about the immovable spindle of the staff head or ...
Page 15
... tripod . Loose the plates from each other , and applying the eye to the sights , turn them by means of the rack wheel till they coincide with the other line , including the angle . The angle may then A MANUAL FOR SURVEYORS . 15.
... tripod . Loose the plates from each other , and applying the eye to the sights , turn them by means of the rack wheel till they coincide with the other line , including the angle . The angle may then A MANUAL FOR SURVEYORS . 15.
Page 16
... means of the nonius . " An instrument constructed in this manner is very convenient in laying out the curves of rail- roads . " A small telescopic tube fixed on the side of the instrument parallel to the line of sights , and move- able ...
... means of the nonius . " An instrument constructed in this manner is very convenient in laying out the curves of rail- roads . " A small telescopic tube fixed on the side of the instrument parallel to the line of sights , and move- able ...
Page 19
... however , would be conducive to accuracy , as a mean of the readings would correct the eccentricity of the instrument . The transit may be considered , for the general purposes of surveying , superior to any A MANUAL FOR SURVEYORS . 19.
... however , would be conducive to accuracy , as a mean of the readings would correct the eccentricity of the instrument . The transit may be considered , for the general purposes of surveying , superior to any A MANUAL FOR SURVEYORS . 19.
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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.