A complete treatise on practical land-surveying, in seven parts; . s the case, you must first measure and plan the ground ; thendraw the equalising line as directed in the last Problem ; and take the dis-tance from A to L, very correctly by the scale. Measure this distance in thefield, from the angle A ; range the division line E L, and takes it out ; andthe work will be completed. 2.—It will be advisable to measure, both on the plan and in the field, theparts cut off on each side, by the division line, in order to prove the work ;for an error committed in dividing land, is of serious conseque
A complete treatise on practical land-surveying, in seven parts; . s the case, you must first measure and plan the ground ; thendraw the equalising line as directed in the last Problem ; and take the dis-tance from A to L, very correctly by the scale. Measure this distance in thefield, from the angle A ; range the division line E L, and takes it out ; andthe work will be completed. 2.—It will be advisable to measure, both on the plan and in the field, theparts cut off on each side, by the division line, in order to prove the work ;for an error committed in dividing land, is of serious consequence, if it be notdiscovered and rectified before the new fence is made. If the discovery takesplace after the groundhas been fenced off, either the fence must be altered, orthe land must be valued ; and the person who has had too much awarded tohim, must pay the balance. PROBLEM XII. It is required to draw an equalising Line by the Parallel Ruler,so that the curved Fence which separates the two Fields in thefollowing Figure, may be reduced to a straight Lay the ruler from 1 to 3; move it parallel to 2 ; and markthe temporary line A B, at 1. Lay the ruler from 1 to 4 ; move it parallel to 3 ; and markthe temporary line at 2. Part V.) LAND-SURVEYING. 227 Lay the ruler from 2 to 5 ; move it parallel to 4 ; and markthe temporary line at 3. Lay the ruler from 3 to 6 ; move it parallel to 5 ; and markthe temporary line at 4. Lay the ruler from 4 to 7; move it parallel to 6 ; and markthe temporary line at 5. Draw a line from 7 to 5, and it will reduce the figure A BC D, to two trapeziums ; hence their respective areas may befound by measuring diagonals and perpendiculars. The following general Rule for the Parallel Ruler,will be found of considerable service to learners ; andmay be easily committed to memory. GENERAL RULE. 1. Lay the ruler from the first to the third angle; move itparallel to the second angle; and you will have the first markon the temporary line. 2. Lay the
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