[GreenKeys] Here Is mechanism

[Henning Treumann]

Lorenz built the licensed version of a Teletype model 15 called Lo15
starting from the
early days of teleprinting. Lorenz was its own company and the biggest
competitor
in communications equipment to Siemens here in Germany.
Here in Germany answerbacks were common (and necessary) with the start of the
public Telex network (inventend by Siemens) in 1932. The network was
automatic from its
first day and designed for unattended 24/7 use of the machines. Hence
from those days almost
all teleprinters were commonly equipped with answerback mechanisms.

Since both machines (TT model 15 and Lorenz Lo15) are basically the
same machines
and Lorenz already had experience with answerback units, maybe
Teletype decided to easily
purchase them from its business and license partner in Germany.

Attached of a picture of an early Lorenz Lo15 keyboard unit with
answerback drum installed.

Henning DF3OE
i-Telex:  925302 TREU D

www.i-telex.net
www.telexforum.de



Am Do., 28. Mai 2020 um 19:25 Uhr schrieb WAYNE <teletypeparts at comcast.net>:
>
> I do recall that model 19 Telex sets had an answerback function.  They were called Lorenz AB units I believe.  Perhaps made by Siemans?
>
> I searched Lorenz and found out it was another version of machine encryption used by Germany in WWII.  No mention of later use as the AB mechanism.
>
> BTW, CTRL WRU pertains to ASCII machines.  The keys to depress to trigger distant ends AB drum.
>
> Figs D were the keys to type to trigger distant ends AB drum on Baudot machines.
>
> 73,
>
> Wayne
> KB1FDW
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