For which of the following permanent adjustments of theodolite, the spire test is used ?
(A) adjustment of plate levels
(B) adjustment of line of sight
(C) adjustment of horizontal axis
(D) adjustment of altitude bubble and vertical index frame
For which of the following permanent adjustments of theodolite, the spire test is used ?
(A) adjustment of plate levels
(B) adjustment of line of sight
(C) adjustment of horizontal axis
(D) adjustment of altitude bubble and vertical index frame
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