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- The camera
- 收景鏡
- A concave lens.
- 凹鏡
- A convex lens.
- 凸鏡
- The former causes light to diverge.
- 凹鏡透光合光展開
- The latter brings it to a focus.
- 凸鏡透光成尖樞
- Electricity.
- 電氣
- Electrical machine.
- 電機器
- The loadstone.
- 攝石
- The magnet.
- 攝鐵
- Magnetic wire.
- 電氣傳鐵線有攝力
- The compass.
- 北南盤
- The indicator or needle.
- 指南針
- Electricity of the earth.
- 地體之電氣
- Electricity of the clouds.
- 天雲之電氣
- Electric state undisturbed.
- 電氣和則靜
- Electric state excited.
- 電氣不和則亂動
- The electric fluids are negative and positive.
- 電氣具陰陽二性
- When separated they strongly attract each other.
- 陰陽離必牽引復合
- Concussion of electric clouds is thunder.
- 電氣在雲中觸擊為雷
- Lightning is the electric flash.
- 閃係電氣所射之火光
- Thunder is harmless, lightning dangerous.
- 殺人非雷是電火
- It is most dangerous when they are together.
- 閃電雷聲齊發為最險
