heliograph   (TTS Sound)

The heliograph has 2 Senses.

• heliograph
• 日照計
• an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on
• 鏡を太陽光線に向けたり逸らしたりして通信メッセージを送る装置

• heliograph
• signal by means of a mirror and the using the sun's rays
• 鏡と太陽光線を使うことによる信号