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These were (are?) used for measuring low vacuum environments, and probably went with an older Edwards Pirani/Penning vacuum chamber.

Trash can food. https://www.idealvac.com/files/manualsII/Varian_571_Ionization_Gauge_Tube.pdf

These were (are?) used for measuring low vacuum environments, and probably went with an older Edwards Pirani/Penning vacuum chamber. Trash can food. https://www.idealvac.com/files/manualsII/Varian_571_Ionization_Gauge_Tube.pdf

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[–] • 1 pt

Fancy glasswork in the old days.