| Dictionary, Encyclopedia and Thesaurus - The Free Dictionary 1,506,617,391 visitors served. |
|
Dictionary/ thesaurus | Medical dictionary | Legal dictionary | Financial dictionary | Acronyms | Idioms | Encyclopedia | Wikipedia encyclopedia | ? |
heliograph |
Also found in: Dictionary/thesaurus, Wikipedia | 0.03 sec. |
|
heliograph (hē`lēəgrăf) [Gr.,=sun-writer], signaling device using flashes of sunlight. It has two mirrors that are used to reflect sunlight on a distant point and a shutter through which the sunlight passes so that messages may be transmitted in telegraphic code by means of long and short flashes. It was used in ancient times and as recently as the 19th cent. by the U.S. army in the SW United States and by the British army in India. heliograph 1. an instrument with mirrors and a shutter used for sending messages in Morse code by reflecting the sun's rays 2. a device used to photograph the sun How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
|
| ? Mentioned in |
|---|
| Encyclopedia |
| Free Tools: |
For surfers:
Browser extension |
Word of the Day |
Help
For webmasters: Free content | Linking | Lookup box | Double-click lookup | Partner with us |
|---|