箱はこ眼鏡めがね

noun

water glass; underwater viewing box

A box-like device with a glass bottom used to observe underwater objects, such as fish or coral, from a boat or shore. Also called a hydroscope.

• 箱はこ眼鏡めがねで海うみの中なかをのぞくと、魚さかながよく見みえる。

  When you look into the sea with a water glass, you can see the fish clearly.

• 子こ供どもたちは箱はこ眼鏡めがねを使つかって川かわ底ぞこの石いしを観かん察さつした。

  The children used a water glass to observe the stones on the riverbed.