Damian and I tried even more things. Including removing and cleaning all connections to the chamber. Nothing worked. We even globed on a bunch of vacuum grease every where to see if there were inadvertent leaks. Again, nothing worked.
Accelerometer power supply
Sarah and I completed the power supply modifications today. This is good news as we can now start looking at the accelerometer for the pendulum
Non ferrous stirrer.
Tommy needed a stirrer for magnetic nanoparticles. So, I ripped apart a hand drill that functioned off of a 6V battery pack. Unfortunately, the battery pack was dead and the charger didn’t work. So, I swapped out the battery pack for a 6V wall wart with not a lot of current. This is fine as the stirring doesn’t need to be fast. By removing the battery pack, the ability to change the speed went away. I’m guessing that there is some way to reinstate this. In the mean time, sorry Hugh for ripping apart your old hand drill. I will fix it when it is no longer needed. The stir bar is a glass pipet that was cleaved and the paddle is a microscope slide that is epoxied to the pipet. No metal!