6 GRIFFIN AND TATLOCK VACUUM TUBES IN A RACK, 1950's

The Cross vacuum scale demonstrates the phenomenon of discharge at different pressures. The pressure in the tubes varies between 40 Torr (mm/Hg), the lowest vacuum in the left tube, to 0.03 Torr the highest vacuum in the right tube.

It is in this high vacuum, used in many Crookes tubes, that X-Ray's are produced.

A0948