Community Wiki answer: I've incorporated "translations" from existing comments on the question; feel free to edit/improve:
1. RTCC SS1 and SS2
RTCC = real time computer complex; the Mission Control computer system
2. MSFN free flight trajectory
MSFN = Manned Space Flight Network, the network of ground tracking stations.
3. Langley model
Langley would ...
The Apollo attitude control system starts from a known orientation established by taking star sightings, then uses gyroscopes to track the change in orientation over time. The problem with gimbal lock is that the system can no longer distinguish the axes of rotation properly, so can't tell how the orientation is changing.
The remedy for gimbal lock is just ...
They worked like standard aircraft types.
Pushed in = circuit closed
Popped out = circuit opened
The "knob" was made of non-conductive plastic (don't know the exact type)
Circuit breakers, are thermal-mechanical in nature. Bimetallic
elements, with one metal expanding more under heat than the other, pop
the breaker open. This also enables them to ...
Cannot identify the specific model, but they would be ancestors of these that work by popping out under load or manual trip and push back in to reset/turn on.
They are widely used in aviation because they are compact and relatively easy to operate by feel. They generally take very little force to pop out, since that is spring assisted.
Because they ...