A Manual for Practical Surveyors: Containing Methods Indispensably Necessary for Actual Field Operations |
From inside the book
Results 1-5 of 6
Page 29
... Tang . angle B A g = B g ÷ Ag Bg ÷ DE . Also , nat . tang . angle BCh is equal to Bh ÷ Ch EF . * Bh ÷ The sum of the angles B Ag and B Ch subtracted from 180 ° , gives ▽ ABC . This method of finding the angle A B C is applicable to ...
... Tang . angle B A g = B g ÷ Ag Bg ÷ DE . Also , nat . tang . angle BCh is equal to Bh ÷ Ch EF . * Bh ÷ The sum of the angles B Ag and B Ch subtracted from 180 ° , gives ▽ ABC . This method of finding the angle A B C is applicable to ...
Page 40
... tang . of the angle of correction ; take out the angle correspond- ing in the table , which will be correct in all cases . We may use the nat . sines instead of tangs . as far as 5o . Example 6th . Suppose a line some years ago bore N ...
... tang . of the angle of correction ; take out the angle correspond- ing in the table , which will be correct in all cases . We may use the nat . sines instead of tangs . as far as 5o . Example 6th . Suppose a line some years ago bore N ...
Page 48
... tang . of 50 this ap- plied to the bearing of C D , will give the bearing of A B. In this case the offsets decrease at the beginning of the line , the correction for the dis- tance between the equidistant stakes , must be subtracted ...
... tang . of 50 this ap- plied to the bearing of C D , will give the bearing of A B. In this case the offsets decrease at the beginning of the line , the correction for the dis- tance between the equidistant stakes , must be subtracted ...
Page 50
... be found by the rules given in Proposition 4 . • As A EFE : 34 38 ' : 3 Or & AE : EF :: 86 ° : 2 FAE EF : FAE FAE . Or F E A E Nat . Tang . = ▽ Place the instrument at A and make the △ FAE 50 A MANUAL FOR SURVEYORS .
... be found by the rules given in Proposition 4 . • As A EFE : 34 38 ' : 3 Or & AE : EF :: 86 ° : 2 FAE EF : FAE FAE . Or F E A E Nat . Tang . = ▽ Place the instrument at A and make the △ FAE 50 A MANUAL FOR SURVEYORS .
Page 62
... tangs . of the angles C D E and C D F , is to the nat . tang . of either of them , so is E F the sum of the seg ments EC and C F , to the segment corresponding to the angle used in the second term of the propor- tion . Otherwise ...
... tangs . of the angles C D E and C D F , is to the nat . tang . of either of them , so is E F the sum of the seg ments EC and C F , to the segment corresponding to the angle used in the second term of the propor- tion . Otherwise ...
Other editions - View all
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.