Cathetometer

Rarity: Common

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At a glance

Class

Notion

Domain

Science and technology

In collections

Nobody has pulled it yet.

What Wikipedia says

A cathetometer is an instrument for measuring vertical distances in cases where a scale cannot be placed very close to the points whose distance apart is desired.

Excerpt from the Wikipedia article “Cathetometer”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ervin S. Ferry, Public domain, via Wikimedia Commons.