The two-peg test in the adjustment of a dumpy level employs the princi

1.	The two-peg test in the adjustment of a dumpy level employs the principle that
A.	equal lengths at back sight and fore sight do not affect the difference in level.
B.	reciprocal levelling eliminates errors of non-parallel instrument and collimation axes.
C.	two readings from the same station will minimize errors in bubble tube axis.
D.	correction is made for verticle axis at one peg and for horizontal axis at the other peg.
Answer» B. reciprocal levelling eliminates errors of non-parallel instrument and collimation axes.

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The two-peg test in the adjustment of a dumpy level employs the principle that

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