A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
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Page 28
... 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- tances A B , BG , G E , which are equal to A B , B C and CD ...
... 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- tances A B , BG , G E , which are equal to A B , B C and CD ...
Page 32
... triangles A B C , A m1 n1 , A m3 n2 , & c . , being similar we have , AC : An1 :: BC : n1 m1 · AC : A no : CB : n2 m2 , & c . AC : AF :: CB : FE . That is , as the whole distance measured from A to C , is to any part of the line ...
... triangles A B C , A m1 n1 , A m3 n2 , & c . , being similar we have , AC : An1 :: BC : n1 m1 · AC : A no : CB : n2 m2 , & c . AC : AF :: CB : FE . That is , as the whole distance measured from A to C , is to any part of the line ...
Page 63
... , 8 , 10 , or 30 , 40 , 50 , & c . , will form right d triangles . Third method : place one end of the chain at C , the point at which a right angle is to be made , ex- E D tend the other end to any con- venient A MANUAL FOR SURVEYORS . 63.
... , 8 , 10 , or 30 , 40 , 50 , & c . , will form right d triangles . Third method : place one end of the chain at C , the point at which a right angle is to be made , ex- E D tend the other end to any con- venient A MANUAL FOR SURVEYORS . 63.
Page 67
... triangle B DE becomes equilateral , and B D = BE . Š Case 7th . To find the horizontal distance A B through a precipice or clift too steep to be mea- sured with the chain . Plant a staff at C on the top of A the cliff , aligning it with ...
... triangle B DE becomes equilateral , and B D = BE . Š Case 7th . To find the horizontal distance A B through a precipice or clift too steep to be mea- sured with the chain . Plant a staff at C on the top of A the cliff , aligning it with ...
Page 72
... triangle B F G should be of such a length , that the angle F B G may be only a few degrees ; if it should be too great , the distances F C and C G will not increase in the same ratio with the angles F BC and CB G. N. B. - If F B G is ...
... triangle B F G should be of such a length , that the angle F B G may be only a few degrees ; if it should be too great , the distances F C and C G will not increase in the same ratio with the angles F BC and CB G. N. B. - If F B G is ...
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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.