Home > 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.
- ส่วนหนึ่งของคำพูด: noun
- อุตสาหกรรม/ขอบเขต: Language
- Category: Encyclopedias
- Organization: Project Gutenberg
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ผู้สร้าง
- JohannesDD
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(V.I.P) 14638 points - 100% positive feedback
(Sydney, Australia)
