[GreenKeys] Red paint on Teletypes...

[Richard Knoppow]

     I found a little history of Glyptal on the web. Evidently, it is a 
General Electric trade name for a type of alkyd paint. Invented in 1901, 
name goes back to 1914, GE made commercial versions from 1948. Used as 
an insulating varnish. My memory of it is as an insulating varnish. Not 
all red marks are Glyptal, some are just lacquer inspection marks. One 
could buy inspection markers, little bottles with a brush tip. Some 
equipment has inspection marks on solder joints and other places an 
inspector would check. This stuff should come off with alcohol. I think 
Glyptal would be more difficult to remove but alkyd paint is very common 
for many purposes including house paint, so any solvent which works on 
alkyd house paint should work.
     GE had a very extensive chemical research department and came up 
with many industrial chemicals including some advanced insulation for 
motor and generator windings that allowed the use of smaller wire. I 
don't know if this was related to Glyptal.
     GE also did a lot of advanced metalurgical research, I think 
stemming from the research on finding better materials than carbon for 
lamp filaments. This was the specialty of Irving Langmuir who became 
famous for sharing with H.D.Arnold, of Western Electric, the discovery 
of the necessity of much high vacuum in vacuum tubes than was thought 
necessary by DeForest. Probably Arnold was the main discoverer but 
Langmuir was a master at self promotion.  In any case, one reason GE was 
chosen to develop jet engines was their history of producing high 
temperature materials for steam and gas turbines.

On 4/17/2017 10:58 AM, Jim Haynes wrote:
> The original Glyptol was a G.E. product.  Blue Glyptol was the thread
> locking stuff, and red glyptol was the inspection mark stuff.  If you've
> ever taken apart a BC-375 transmitter or one of the TU-xx tuning units
> for it you've encountered blue Glyptol.
>
> So far as I know Teletype Corp. never used either kind of Glyptol.  For
> thread locking they used lock washers - it was understood that you didn't
> want to make disassembling hard, since you might have to replace parts.
> Unlike the BC-375 which was intended for use in airplanes with lots of
> vibration and you didn't want anything coming apart in flight.
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-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL