| 单词 | heliograph |
| 释义 | heliograph —heliographer /hee'lee og"reuh feuhr/, n. —heliographic /hee'lee euh graf"ik/, heliographical, adj. —heliographically, adv. —heliography, n. /hee"lee euh graf', -grahf'/, n. 1. a device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance. 2. Astron. photoheliograph. 3. Meteorol. an instrument for recording the duration and intensity of sunshine. 4. Photog. , Print. an early type of photoengraving made on a metal plate coated with sensitized asphalt. v.t. , v.i. 5. to communicate by heliograph. [1815-25; HELIO- + -GRAPH] |
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