Wireless Telegraphy Manual from 1915

Steve Davis sends along scans of the cover and the introduction page from a wireless manual published in 1915. It's a good benchmark for just how things changed in the next ten years. Not to say things aren't changing now, but our radio is a somewhat different animal. As always, click on the image for a larger version.

And the Introduction: Consider how cool it must have been for the two teenagers in 1915, who could accomplish text messaging and all sorts of other advanced telegraphic geekery.