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Dan Eldredge and the cryovac test chamber. One of the "dogs" has not been clamped over the opening. When vacuum was applied, the cover pulled down over the chamber enough to loosen the dogs. This caused the lower dogs to fall and smack against the support legs, making an enormous sound. For many weeks, this sound would cause us all to jump, in fear of some catastrophe. But, after a while and many cycles of the chamber, we learned to relax once the dogs fell, as that indicated the vacuum pumping was progressing nominally.
Roughing the large 6061 aluminum plate that would become the lower warm bulkhead for Mimir. This lathe was located in the Boston University Scientific Instrument facility, where almost all the Mimir fabrication took place. This bulkhead would go on to hold the G10 collar that supports all of the cold mass inside Mimir. The bulkhead also hosts all the electrical and vacuum feedthroughs to the cold vacuum volume.