| 单词 | sun telegraphy |
| 释义 | > as lemmassun telegraphy ΘΚΠ society > communication > indication > signalling > visual signalling > heliography > [noun] sun telegraphy1875 sun-signalling1876 heliography1887 1875 Jrnl. Soc. Telegr. Engineers 4 25 The chief objection to the adoption of the sun-telegraphy is that we cannot command the sun to shine in the same manner as we have command over a galvanic battery. 1899 Sheffield & Rotherham Independent 21 Dec. 5/4 As to the distance over which sun telegraphy can travel, it would seem that the record was obtained by French engineers in Algeria. < as lemmas |
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