[GreenKeys] Cleaners, lubricants, pipe-dream "The way things work" animat...

[KFIam640@aol.com]

In a message dated 7/19/2003 11:23:05 PM Pacific Daylight Time, 
TMcNerney@ChipWrights.com writes:

> P.S. True, there is a lot of exposed machinery in any Teletype, and there
> nothing stopping you from running the machine in super-slo-mo and watching,
> for example, how the type-box move into position, assuming you can set a
> specific state of the code bars "by hand"...
> 

This is exactly what I did with my Model 26 Teletype machine shortly after I 
acquired it in 1954.  I had no idea how it worked but after looking at it I 
realized the keyboard needed to be in series with the selector magnet.  I also 
read somewhere that a 60 milliampere loop current was needed.  I rigged up a 
loop supply and then started cranking the motor by hand so I could observe how 
the machine worked in very slow motion.  It was fascinating to see the keyboard 
form the five level code and watch the selector magnet and associated 
mechanics convert the code to mechanically drive a hammer at the right time to strike 
the right print character on the type wheel.  After observing and learning 
how the Teletype machine worked I realized it is a marvel of mechanical 
engineering.

My old Model 26 Teletype machine is now at the NADCOMM museum in San Diego.

Marvin Collins, W6OQI


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