A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 17
... lines or measuring irregular pieces of ground . A block of hard- grained wood , three or four inches square , and one and a ... line joining the cross , and the object observed . The Graphometer , or Semicircle , is also a very useful ...
... lines or measuring irregular pieces of ground . A block of hard- grained wood , three or four inches square , and one and a ... line joining the cross , and the object observed . The Graphometer , or Semicircle , is also a very useful ...
Page 28
... line A B pro- duced . Make B G B C and join C G , the triangle B C G is equilateral ; also C G and D E are parallel , there fore D E G C is a rhomboides , and E G is equal to CD . Consequently , A E is equal to the sum of the dis ...
... line A B pro- duced . Make B G B C and join C G , the triangle B C G is equilateral ; also C G and D E are parallel , there fore D E G C is a rhomboides , and E G is equal to CD . Consequently , A E is equal to the sum of the dis ...
Page 59
... lines were to note the difference be- tween the bearing now found and that given , by applying this difference to ... line joining them may be at right angles with A C. Also , measure B C , and set two stakes a few feet apart at right ...
... lines were to note the difference be- tween the bearing now found and that given , by applying this difference to ... line joining them may be at right angles with A C. Also , measure B C , and set two stakes a few feet apart at right ...
Page 60
Containing Methods Indispensably Necessary for Actual Field Operations E. W. Beans. a line joining the former two stakes will intersect a line joining the latter two in the point C , the angular point required . Case 8. When C B bears ...
Containing Methods Indispensably Necessary for Actual Field Operations E. W. Beans. a line joining the former two stakes will intersect a line joining the latter two in the point C , the angular point required . Case 8. When C B bears ...
Page 63
... line joining D C will be at right angles to A B. In the same manner , another point E on the other side of A B may be found . Or thus , set the compass at C , and take the bear- ing of AB . Subtract this from 90 ° , changing N to S or S ...
... line joining D C will be at right angles to A B. In the same manner , another point E on the other side of A B may be found . Or thus , set the compass at C , and take the bear- ing of AB . Subtract this from 90 ° , changing N to S or S ...
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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.