stenometer
noun
ste·nom·e·ter
| \ stə̇ˈnämətə(r), -mətə-\
Definition of stenometer
: an instrument for measuring distances consisting of a telescope mounted on a tripod and fitted with a micrometer screw so that the distance may be measured to a rod carrying two targets a known distance apart whose images are brought together in the telescope by the micrometer screw
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