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"vernier engine throttle settings were controlled using a proportional-plus-derivative
feedback loop closed around the measured vs. desired velocity magnitude as
a function of altitude, represented by the [~parabolic] descent contour"
Surveyor Spacecraft Automatic Landing System
Sam W. Thurman
AAS 04-062

NYC Subway Bowling Green Tower Interlocking Panel in Auto Mode -
"The NYC Subway Bowling Green satellite tower was installed in 1956 replacing an earlier electro-mechanical interlocking machine with an all-relay plant controlled by a US&S Style C unit lever machine. This machine controlled the local crossovers as well as both loops through the old South Ferry station. The tower was put under remote control to the new Rail Control Center in 2009 and is now only staffed during non-standard service plans or disruptions.

Watch as #(4)/(5) trains arrive and depart the station and how it is represented on the model board. The upper row of unit levers represent switches, all in the normal position, the second row are controlled signals."

“But I gotta wonder: How do they do it?”
And as I recall, you're pretty dang smart!
 —  @pitosalas

Thing Explainer | xkcd

"Thing Explainer cover all kinds of neat stuff—including computer buildings (datacenters), the flat rocks we live on (tectonic plates), the stuff you use to steer a plane (airliner cockpit controls), and the little bags of water you’re made of (cells)."

Online Apollo Guidance Computer Simulator
My very 1st G+ search for deep passionate geek stuff. @mikeelgan @twit suggestion. Too cool.

Remarkable research and model (in Orbiter) of the Gemini rendezvous process

Gemini semi-optical rendezvous tutorial (v 0.3)