heliograph >> ˈhiːlɪə(ʊ)ɡrɑːf
Definition: [noun] a signalling device by which sunlight is reflected in flashes from a movable mirror.
Definition: [noun] a telescopic apparatus for photographing the sun.
Definition: [noun] a type of early photographic engraving made using a sensitized silver plate and an asphalt or bitumen varnish.
Definition: [verb] send (a message) by heliograph.
Example: the glasses seemed to be heliographing a warning
Definition: [verb] take a heliographic photograph of.
Example: he could only heliograph static subjects in very intense light