Heliographs: Cutting-Edge Victorian Military Communications

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Developed in the 1870s, heliographs used reflected sunlight to send coded messages over long distances. Surprisingly useful despite their simplicity, heliographs were used by military and civilian organizations (e.g. forestry services) for over 100 years.

0:00 Introduction
0:47 World of Warships Promo
2:21 Development of the Heliograph
6:31 Heliograph Users
9:15 Setup, Controls, and Accessories
12:14 Alternative Heliograph Designs
14:04 Survival Heliographs
15:00 Outro

SOURCES:
http://www.rcsigs.ca/index.php/Lamp_S...
https://www.historynet.com/light-conv...
http://www.smecc.org/heliograph_-_sig...
https://www.royal-signals.org.uk/Data...
https://books.google.ca/books?id=pzkZ...
https://books.google.ca/books?id=sA5K...
https://www.nps.gov/fobo/learn/histor...
https://nzhistory.govt.nz/media/photo...
https://www.gvrhc.org/Library/Heliogr...
https://www.modulatedlight.org/Modula...
http://phillosoph.blogspot.com/2016/0...
https://patents.google.com/patent/US2...