. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 8o ENGINEERING FOR LAND DRAINAGE. The bearing of a line is the angle which it makes with the direction of the magnetic needle. The length of a line with its bearing is termed its course. To take the bearings of a line, set the compass directly over a point in it at one extremity if possible, though this is not essential. Bring the compass to a level position. Have a flag or rod set on another point of. Fig. i6.—Taking Compass Bearmgs. the line. Direct the sights
. Engineering for land drainage. A manual for laying out and constructing drains for the improvement of agricultural lands. Drainage. 8o ENGINEERING FOR LAND DRAINAGE. The bearing of a line is the angle which it makes with the direction of the magnetic needle. The length of a line with its bearing is termed its course. To take the bearings of a line, set the compass directly over a point in it at one extremity if possible, though this is not essential. Bring the compass to a level position. Have a flag or rod set on another point of. Fig. i6.—Taking Compass Bearmgs. the line. Direct the sights upon this rod as near the bottom as possible. Always keep the north end of the compass ahead. It is distinguished from the south end by some conspicuous mark on the face. Sight accurately to the flag and read the north end of the needle. To do this, note first whether the N. or S. point of the compass is nearest the north end of the needle, second, the number of degrees to which it points, and third, the letter E. or W. nearest the north end of the needle. Always read and record bearings in this Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Elliott, Charles Gleason, 1850-1926. New York, J. Wiley
Size: 1396px × 1789px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1903
