A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 28
... point in one of the lines , including the angle to be measured , run the line D E F till we arrive at the point F , opposite C a point in the other line B C including the required angle . At E opposite the angular point B , measure the ...
... point in one of the lines , including the angle to be measured , run the line D E F till we arrive at the point F , opposite C a point in the other line B C including the required angle . At E opposite the angular point B , measure the ...
Page 30
... angular point B ( see the pre- ceding figure , ) after having adjusted it for obser- vation , set the vernier to zero , and bring the tele- scope to bear on the staff at A in one of the lines , including the angle to be measured ; clamp ...
... angular point B ( see the pre- ceding figure , ) after having adjusted it for obser- vation , set the vernier to zero , and bring the tele- scope to bear on the staff at A in one of the lines , including the angle to be measured ; clamp ...
Page 53
... angular points are established , run the lines from one angular point to another , by the methods already given . Case 2. When the angular point is known to be in a right line with two other points , and at a given distance from each of ...
... angular points are established , run the lines from one angular point to another , by the methods already given . Case 2. When the angular point is known to be in a right line with two other points , and at a given distance from each of ...
Page 59
... angular point C is to be de- termined from the distances AC and B C only , the points A and B being known . Measure A C as nearly as may be in A the direction of C , and at the end of the distance , set two stakes a few feet apart , so ...
... angular point C is to be de- termined from the distances AC and B C only , the points A and B being known . Measure A C as nearly as may be in A the direction of C , and at the end of the distance , set two stakes a few feet apart , so ...
Page 60
... point C , the angular point required . Case 8. When C B bears but a few degrees from A C. B A Prolong AC towards D. With the angle of deflection B CD as a course , and B C a distance , enter the traverse table , and take out the ...
... point C , the angular point required . Case 8. When C B bears but a few degrees from A C. B A Prolong AC towards D. With the angle of deflection B CD as a course , and B C a distance , enter the traverse table , and take out 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.