O.K. So my estimate of the size of the glass parts was wrong. Not bell jars, but rather something similar to cap over a cut to collect blood.
At least this explains the trigger like protrusions on the devices.
And -- of course -- no physical access to verify that.
Or -- they are parts which go inside the scarificators and they have never dared disassemble their collection's occupants.
But -- they *could* have been something simply stored in the same box with the parts of someone's collection -- for lack of someplace else more appropriate to store them.
Enjoy, DoN.