Video

Epic. Saw it in March 2003 when it still needed wiring. I'm trying to thoroughly understand how Colossus works, so I'm deep into reading about thyratron rings and Siemens Type 2 Uniselectors. In particular on the Uniselector, I was wondering how they reset themselves, but they don't have too: they can revolve continuously, always in the same direction. There are have two sets of wipers 180 degrees apart, so when one leaves the half-ring of contacts on the high side, the other set of wipers is entering the half ring on the low side. You still have to arrange to detect what you consider the home setting, and stop there, but that's easily done. There were 51 available contacts (52 positions with one unused). How did they encode the starting positions of Psi 4 and Psi 5, with 53 and 59 positions respectively? Did they gang two Uniselectors in pairs, or use more contacts? Looking at the video, it took me a while to realize that the wheel start position indicators are in decimal (with a tens place) to accommodate the large position counts on the Lorenz wheels. The uniselectors only store the current starting wheel settings, right? They don't advance for every character read off the tape, or they'd be torn apart (they were rated for a maximum of 240 operations per second, nowhere near 5,000 characters per second)? So the actual key sequence is generated entirely electronically, just using the uniselectors for marching orders (start point)? I love how the whole thing syncs to the input tape speed, too, that was the "right way round" to do it after the disaster of the Heath Robinsons.

Would you have any idea of ​​the price of a device like this?

Cool

Very interesting. You can see the wheel stuttering and the different rate at which the different wheels rotate, depending on how many connections each wheel has. All the explanations are suddenly visible in real time.

Hi, very interresting video. I am chasing such kind of m-209 description since long time.

Более подробно бы , я до сих пор не понимаю как она работает , но крайне интересно

That Tommy Flowers, he was a clever cove!

why no likes and comments

Can I be a pedant and say Eliot 803 ALGOL differed from 'real ' ALGOL 60 in some ways, the illustration shows the use of ' as the end of line delimiter rather then ; just one thing I remember from working on an 803 in Bletchley Park 'D' block back in the 1970's. I wonder what happened to that one ?

Do the automated transmissions still work? Radio hasn't received anything even when waiting at the times, or is there a cutoff period?

really cool !! and so interesting ! love it !

czcams.com/video/VcWoYHdNwBQ/video.html

so it was all digitlal zeros and ones eh! mmmmmmmmmmm 00111 01110 11000 10100 mmmmmmm

This machine is based on the Vernam Cipher machine patented in the USA in 1919. But whereas that apparatus used relay logic to accomplish it XOR logic based encryption, this Lorenz machine used all mechanical logic based on rotating disks

Beautiful work!

Super interesting, can't wait to try it out.

amazing!

a marvel. I saw this machine in Bletchley back in 2014. Not working, of course.

Thank you

Quite astonishing...

I am John Tiltman's grandchild (one of five), living in Hawaii. Thanks for the video.

Thank you for the demonstration. This is of great historical and technical value.

Totally useless video without a description !

Oh you mad bastards, I love it, if y'all are still working what comes next, are you going to try and tackle something like Purple or SIGABA?

Precision German engineering! <3

Wow, thank you for uploading, my great uncle was one of the people who built Colossus