he·li·o·graph
noun/ˈhiːliəɡrɑːf/
/ˈhiːliəɡræf/
- a device that gives signals by reflecting flashes of light from the sun
日光反射信号器；日光仪 - (also heliograma message that is sent using signals from a heliograph/ˈhiːliəɡræm//ˈhiːliəɡræm/)
日光反射信号 - a special camera that takes photographs of the sun
（拍摄太阳用的）太阳照相仪