An apparatus with a movable mirror for reflecting the rays of the sun, used for signalling and other purposes, esp. in geodesic operations: cf. helio…
| 单词 | θ191732 |
| 释义 | society > communication > indication > signalling > visual signalling > heliography > [noun] > apparatus (3) heliotrope1822 An apparatus with a movable mirror for reflecting the rays of the sun, used for signalling and other purposes, esp. in geodesic operations: cf. helio… heliograph1877 An apparatus for signalling by means of a movable mirror which reflects flashes of sunlight to a distance. Cf. heliotrope, n. 4. Also attributive. helio1893 = heliograph, n. 4a. |
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