Quickcomputerstips
Heliograph
How is a heliograph used as a safety device?
What is a heliograph used for? The heliograph was the invention of a British engineer who attached a mirror to surveying equipment in order to redirec...
Heliograph mirror
What is a heliograph mirror? heliograph. / (ˈhiːlɪəʊˌɡrɑːf, -ˌɡræf) / noun. an instrument with mirrors and a shutter used for sending messages in Mors...
Heliograph measures
What unit of measurement does a heliograph use? The energy received from a given surface, instead, is called global radiation, and is measured with an...