홈 > Term: heliography
heliography
A method of signalling from distant points by means of the sun's rays flashed from mirrors; messages can in this manner be transmitted a distance of 190 m.; it has been found of great practical value in military operations.
- 품사: noun
- 분야/도메인: 언어
- 카테고리: Encyclopedias
- Organization: Project Gutenberg
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작성자
- JohannesDD
-
(V.I.P) 14638 포인트 - 100% positive feedback
(Sydney, Australia)
