[sdiy] Moog Ribbon Controller Mechanical design

[Grant Richter]

I have been looking at Ribbon Controllers due to the Spectrasymbol  
softpots of course.

Ian Fritz has already developed an excellent interface using only the  
resistive element for control of the S/H and trigger.

My first reference was of course the Moog design.

I realized the I have no idea how the ground, RF trigger strip and  
resistive strip were actual physically related, I have never seen the  
actual device in person.

I have no illusions that I could improve on Ian's as usual elegantly  
low parts count design.

But for the sake of historical completeness, I would be interested to  
know how Dr. Moog actual accomplished it the first time around.

I have a C size blueprint labeled 956 Ribbon Controller Schematic and  
dated 1-22-69 R. A. Moog Co.

I also have the Norlin Accessories service manual labeled Ribbon  
Controller (Model 1150) dated 1979.

The 1969 version is completely discrete where the 1979 version adds a  
few 741 op-amps.

 From the picture on the cover, it appears there are three ribbons  
from closer to further away, a thin ribbon, a fat ribbon and anther  
thin ribbon located about 1/4" above the fat one.

There also looks to be a round bar of some kind.

Can any kind soul familiar with this either of these controllers  
confirm my guess that the trigger ribbon was located physically above  
the resistive element, and so contact would be made first and broken  
last?

Thank you for any information.