During a levelling work along a falling gradient using a Dumpy Level and a Staff of 3 m length, following successive readings were taken: 1.785, 2.935, 0.360, 1.320. What will be the correct order of booking these four readings in a level book? (BS : Back Sight, IS : Intermediate Sight, FS : Fore Sight)
MEih ysoy vkSj 3 ehVj yackbZ ds LVkiQ dk mi;ksx djds fxjrs <ky ds lkFk leryhdj.k dk;Z ds nkSjku] fuEufyf[kr Øfed jhfMax yh xbZa% 1.785, 2.935, 0.360, 1.320 A ysoy cqd esa bu pkj jhfMax dks ntZ djus dk lgh Øe D;k gksxk\ (BS : cSdlkbV] IS : baVjehfM,VlkbV] FS : QksjlkbV)
BS, FS, BS, FS
BS, IS, FS, FS
BS, IS, IS, FS
BS, IS, BS, FS
BS, FS, BS, FS
The first reading is always BS. The second reading is foresight because the instrument has been shifted after this reading which is evident from the low value of third reading. Since the instrument has been shifted the third reading is backsight again. Successively the fourth reading is foresight.
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