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Theodolites, like all instruments, are susceptible
to errors of construction and adjustment. The effect of some of these
errors can be ignored in the context of these reference notes however
there are others that must be eliminated or reduced for the derived
angle to have reliability.The theodolite is subject to the various
errors listed below.
These errors are caused by the manufacturing process
and by changes in adjustment caused by time and use. There is not
much that we can do regarding errors of construction, but for most
applications these can be ignored as the manufacturers generally meet
high standards. The errors in our angular observations caused by the
state of calibration of the instrument can be reduced in the field
by using the appropriate procedure, or compensated for in the reduction
of the angles.
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