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1. Oxford Dictionary

   heliograph

   • IPA[ˈhiːlɪə(ʊ)ɡrɑːf]

   英式

   • n.
     a signalling device by which sunlight is reflected in flashes from a movable mirror.；a message sent by heliograph; a heliogram.
   • v.
     send (a message) by heliograph；take a heliographic photograph of

   • verb: heliograph, 3rd person present: heliographs, gerund or present participle: heliographing, past tense: heliographed, past participle: heliographed

   • noun: heliograph, plural noun: heliographs

2. • 釋義

   n.

   名詞

   • 1. a signalling device by which sunlight is reflected in flashes from a movable mirror.
   • ▪ a message sent by heliograph; a heliogram.
   • 2. a telescopic apparatus for photographing the sun.
   • 3. historical a type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish.

   v.

   動詞

   • 1. send (a message) by heliograph the glasses seemed to be heliographing a warning
   • 2. historical take a heliographic photograph of he could only heliograph static subjects in very intense light
3. • 更多解釋

   heliograph

   • IPA[ˈhēlēōˌɡraf]

   美式

   • n.
     a signaling device by which sunlight is reflected in flashes from a movable mirror.
   • v.
     send (a message) by heliograph: the glasses seemed to be heliographing a warning

   Oxford American Dictionary