heliograph
noun/ˈhiːliəɡrɑːf/
/ˈhiːliəɡræf/
- a device that gives signals by reflecting flashes of light from the sun
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- (also heliograma message that is sent using signals from a heliograph/ˈhiːliəɡræm//ˈhiːliəɡræm/)
- a special camera that takes photographs of the sun
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heliograph