ヘリオグラフ

noun

heliograph; solar telegraph

A device that uses sunlight and mirrors to send signals over long distances. Related to 日照計 (sunshine recorder) but distinct in purpose.

See also: 日照計

• 19世せい紀きの軍ぐん隊たいはヘリオグラフを使つかって遠とおくの部ぶ隊たいと通つう信しんした。

  In the 19th century, armies used heliographs to communicate with distant units.

noun

heliographic process

In photography, an early process for reproducing images using sunlight and a light-sensitive surface.

• ニエプスはヘリオグラフという技ぎ法ほうで最さい初しょの写しゃ真しんを撮さつ影えいした。

  Niépce took the first photograph using a technique called heliography.