[GreenKeys] an interesting little selector mod

[John Nagle]

On 2/12/2012 9:02 AM, greenkeys-request at mailman.qth.net wrote:
> From: Jim Haynes<jhhaynes at earthlink.net>
>
> Offhand I'd guess Teletypesetter
>
> On Sat, 11 Feb 2012,gil at baudot.net  wrote:
>
>> >  Hey folks:
>> >
>> >  Here's an interesting little selector mod -- ebay # 260941621770
>> >
>> >  gil

     It's a Teletypesetter, of course, and a very early model.
See U.S. Patent #1,883,955, "Selecting Telegraph", by Klienschmidt,
from 1928, which shows a somewhat similar typesetting mechanism.

     Note the similarity to a Model 12 Teletype.  The serial to
parallel conversion is done by starting a commutator and feeding
the bits out into one relay per bit.  The character is then
transferred out in parallel to one selector magnet per bit,
like the arrangement in the photo, where you can see the six
magnets at the left end of the assembly.  The 1 out of N
decoding function is performed mechanically, with a setup
like Model 14 and 15 machines where the code bars have
slots encoding the character, and when the slots line
up, the proper sensing bar drops into the slot.  On a
14 or 15, those code bars are arcs, but for the Teletypesetter
shown, they're straight.

     This mechanism is on the back side of the Linotype.
Later versions were add-ons at the keyboard side. See
"http://www.archive.org/stream/TTSMoreTypeInLessTime1961",
page 18.

					John Nagle