Heliograph
01
هيليوغراف, جهاز للإشارة باستخدام ضوء الشمس
a device used for signaling over long distances using sunlight and a mirror, in which the mirror is used to reflect sunlight in a coded pattern to convey messages
to heliograph
01
الإشارة بواسطة مرآة وأشعة الشمس, الإشارة بالهليوغراف
signal by means of a mirror and the using the sun's rays
