How photographs were transmitted by wire in 1937 - GIF

How photographs were transmitted by wire in 1937.

<video controls autoplay loop>
<source src="https://diqn32j8nouaz.cloudfront.net/transmitting_photographs_in_1937.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>


Previously:

https://www.homemadetools.net/forum/...599#post185940
https://www.homemadetools.net/forum/...320#post173101
https://www.homemadetools.net/forum/...827#post163791
https://www.homemadetools.net/forum/...465#post158563

It is a fax machine!

Interestingly, the fax machine was invented in the 1840s by Alexander Bain (patent in 1843) - well before the telephone was invented and almost a century before this device...