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

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

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Surveying
Dumpy level is most suitable when

many readings are to be taken from a single setting of the instrument
the instrument is to be shifted frequently
fly levelling is being done over long distance
All of these

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