The Aeroplane in War

[Alex Fraser]

"The Aeroplane at War" is an interesting book from 1914 and freely 
available at Project Gutenberg. There are lots of good pictures.
The links will take you to the HTML versions.  There are versions for 
E-book readers. Epub, Kindle etc..

https://www.gutenberg.org/cache/epub/63597/pg63597-images.html

The part of special interest for radio is the eighth section

https://www.gutenberg.org/cache/epub/63597/pg63597-images.html#eighth-section-wireless-telegraphy-and-photography-as-aids-to-aerial-reconnaissance
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