. The railroad engineer's practice . Measure D E and E A; then tan. AO D = ED COS. CO A B^ AER sin. AOD EDDOC=COA — AOD. In practice, however, *4 E is generally very small in compari-son with E D, and it is then a sufficient approximation to turnthe transit when at D on A, and measure the angle -1 D E, andmake DOC =■ ADE. Problem 10. To draw a tangent to two curves already When the curves are in opposite Stop both curves before getting to the tangent points. Ob- 16 serve B AC and A B D, and measure AB. Jn the triangle ABC,calculate C B, C B A and .1 C B (.4 C, A B and
. The railroad engineer's practice . Measure D E and E A; then tan. AO D = ED COS. CO A B^ AER sin. AOD EDDOC=COA — AOD. In practice, however, *4 E is generally very small in compari-son with E D, and it is then a sufficient approximation to turnthe transit when at D on A, and measure the angle -1 D E, andmake DOC =■ ADE. Problem 10. To draw a tangent to two curves already When the curves are in opposite Stop both curves before getting to the tangent points. Ob- 16 serve B AC and A B D, and measure AB. Jn the triangle ABC,calculate C B, C B A and .1 C B (.4 C, A B and C A B beingknown). In the triangle BCD calculate C D,BDC and DOBC-B C, BD and CBD=CBA-\-ABD, being known). Cos. EDC = R -\- R CD. BDE-B DC—E DCACG = ACB — {EDC + D C B). 2d. When the curves are in the same direction. This is an ex-tension of Problem 4. Problem 11. To substitute a compound curve for a simple one.(Hencks Pocket Book, p. 59.) V.
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