signalling by means of flashes of reflected sunlight; = heliography, n. 4.
单词 | θ191730 |
释义 | society > communication > indication > signalling > visual signalling > heliography > [noun] (10) sun telegraphy1875 signalling by means of flashes of reflected sunlight; = heliography, n. 4. sun-signalling1876 signalling by means of flashes of reflected sunlight; = heliography, n. 4. heliography1887 The system of signalling by means of the heliograph, n. 4. Subcategories:— person who (1) — apparatus (3) — message (3) |
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