Heliograph

hē′li-o-graf, n. an apparatus for signalling by means of the sun's rays: an engraving obtained by a proce in which a specially prepared plate is acted on chemically by exposure to light: an apparatus for taking photographs of the sun.— v.t. to signal to by means of the sun's rays.— n. Heliog′rapher .— adjs . Heliograph′ic , -al .— adv. Heliograph′ically .— ns. Heliog′raphy , a method of communicating swiftly between distant points by means of the sun's rays reflected from mirrors: photography; Heliogrā′vure (or hā-li-ō-gra-vür′), photo-engraving, or a print obtained by this proce . [Gr. hēlios , the sun, graphē , a painting— graphein , to write.]