By means of heliography.

An apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight. / A heliogram. / An instrument for measuring the intensity of sunlight. / A device for photographing the sun.

(transitive) To send a message by heliograph. / (intransitive) To send a heliograph. / (transitive, dated) To photograph by sunlight.

plural of heliograph

Third-person singular simple present indicative form of heliograph

present participle of heliograph

simple past tense and past participle of heliograph

Of or pertaining to heliography; transmitted by heliograph

plural of heliographer

One who signals by heliography. / (obsolete) A photographer.