[GreenKeys] Old ideas recycled - Cardwell

[Duncan Brown]

Enclosed is a picture of the AWA's "Cardwell" printer.  It is a model 
212C  The company name was "American Telegraph-Typewriter and was 
developed by Dr. George A. Cardwell.

It was a 6-bit system with bipolar signalling. The printer was all 
solenoid-driven (no motor) and was said to be able to print as fast as 
one cold type.  The type cylinder is in the center, but hard so see. Our 
unit has a tag that says "Adjusted & oiled; 6/17/8" (1908!)

Apparently Dr. Cardwell was overzealous in selling his stock and was 
convicted of stock fraud and fined $2000 in 1915.  His son, Allen D. 
Cardwell, was more successful, starting the Cardwell Capacitor company 
and developing the BC-221 frequency meter.

have fun,

Duncan
K2OEQ


On 20-May-23 23:18, Jim Haynes wrote:
>
> First, for one non-green-key one - there was the invention of frequency
> hopping spread spectrum by actress Hedy Lamarr and musician George 
> Antheil.  Not practical with the technology of the time, but now
> important.
>
> Then there was the Cardwell teleprinter - AWA museum has one - which used
> a type cylinder as the printing element.  Came back as the printing 
> elemnt
> in Teletype Model 28 typing reperforators, and then in Model 32/33.
>
> Teletype patented a daisy wheel printer about the same time as the
> Model 26, but I guess the Model 26 typing method looked better at the
> time (and had already been proved in the stock ticker).  But it took
> later plastic technology to make the cheap molded daisy wheels possible,
> and microelectronics to have a nice way of using them in a printer.
> I don't know if daisywheel printers were used as communication terminals,
> but they sure knocked the socks off Teletype designs like Model 37.
>
>     ---
>
>     "Ya can argue all ya wanna, but it's dif'rent than it was."
>     "No it ain't! No it ain't!  But ya gotta know the territory."
>         Meredith Willson, The Music Man
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