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Showing posts with label
heliograph
.
Show all posts
Showing posts with label
heliograph
.
Show all posts
Monday, 4 February 2013
The Heliograph– vintage solar communication
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Back to vintage technology today. Before the telegraph there was the Heliograph, an instrument that reflected the sun's light to an o...
Wednesday, 30 January 2013
A brief history of the telegraph in Australia
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If you’ve read or seen Terry Pratchett’s Disc World series, and Going Postal in particular, you will understand what a shutter semaph...
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