Surveying
For accurate work, the steel band should always be used in preference to chain because the steel band

is easier to handle
is practically inextensible and is not liable to kinks when in use
is lighter than chain
can be easily repaired in the field

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Surveying
Theodolite is an instrument used for

measurement of horizontal angles only
tightening the capstan-headed nuts of level tube
measurement of vertical angles only
measurement of both horizontal and vertical angles

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