測そく鉛えん

noun

sounding lead; plummet

A weight on a line used to measure water depth or to test vertical alignment. Technical term used in surveying, navigation, and construction.

• 測そく鉛えんを使つかって水すい深しんを測はかる。

  Measure the water depth using a sounding lead.

• 昔むかしの船ふねは測そく鉛えんで海かい底ていの深ふかさを調しらべた。

  Old ships checked the depth of the seabed with a plummet.