[GreenKeys] How The Teleprinter Works- 1940 (11:05 mins)

[Brent Jones]

> just  to clarify... single current  working is like  comes out of the back of HAL >st-5000  tu? Smoke is the only thing that comes out of the back of my Hal TU. Kidding. Single current is what Yanks would call Neutral, and double current would be called Polar. I'm still trying to figure out what the Motorcycle Messenger says to the Message Clerk at the end of the video. It sounds like he says "Wire Hound". Any guesses? Kevin/WW2TTY
*I can't remember the exact words but the lady had told him he'd be back 
by 2:30pm.
So I think he said a version of not likely or words to that effect

Brent Jones

*
>   In a message dated 1/27/2015 4:10:33 P.M. US Mountain Standard Time,s.hallas at ntlworld.com  writes:Ed Sharpe Archivist for SMECC via GreenKeys wrote:
> Henry - notice too it is in the  early  color process  too...
> this is great !!   Thanks  for sharing it  with us .
> I had not seen the workings  of  one  with a print wheel like that  before.
> In a message dated 1/26/2015 8:21:02 A.M. US Mountain Standard Time,
> henry.eck at statisticalfinance.com  writes:
>      This is an instructional film from BT which illustrates some
>      mechanisms in a teleprinter (but not the clutch/selector).
>      https://www.youtube.com/watch?v=HcMHam54EOI

What a clever model of a Creed Model 7!. It shows the complicated way
the bellcranks select the letters, but it's a pity it doesn't mention
the start/ stop synchronisation.

It also implies single current working, but as far as I know the British
Post Office always used double current polar working.

I hope BT Heritage will be uploading more of their historic films. They
covered the telephone and postal service as well. I look forward to
seeing more of them.
Their YouTube channel is at
<https://www.youtube.com/user/btletstalk/videos>

Cheers,
Sam

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