[GreenKeys] Fw: BBC enquiry - telegraph machine

[Sam Hallas]

paul0926 at comcast.net wrote:
> Jim Haynes wrote:
>> If the message was intercepted by cable it would have been on an
>> undulator.
>
> Having no idea what an undulator is or looks like, I went to the Internet to look it up.  Clearly these:
>
> http://tinyurl.com/m4vmzyg
>
> would have been overkill.
>
> Anybody have a picture of one?

I posted one earlier. Here's a different view of the same machine and 
the one at RAF Henlow.

<https://plus.google.com/photos/102989156097027194818/albums/6025994267175183521>