Results for: Heliograph

In Inventions

What is a heliograph?

A heliograph is a way of showing where the sun is at all times. Theword "helio" comes from the Greek meaning "sun".
In Definitions

How do you use heliograph in a sentence?

The heliograph was standard issue for the British and Australianarmies until the 1960s. . I'm looking for a new mirror for my heliograph. . There were many heliograph types. (MORE)