Definitions
1.nounAn apparatus for signalling by means of a moveable mirror which reflects flashes of sunlight.
2.nounA heliogram.
3.nounAn instrument for measuring the intensity of sunlight.
4.nounA device for photographing the sun.
5.nounA photograph.
6.verbTo send a message by heliograph.
7.verbTo send a heliograph.
8.verbTo photograph by sunlight.