Check out the insides of a Nixie Tube counter, cool…

From the 1950’s until about 1970, nixies were a dominant display technology. “NIXIE” is actually a brand name for display tubes made by Burroughs, and the proper generic name might be “cold cathode neon readout tube.” However, as with facial tissue, a single short word involving the letter ‘X’ had more widespread appeal. Whatever you call it, they were used in all manner of electronic instruments that needed to display numerical data until they were ultimately made obsolete by the introduction of LEDs. One of the common places that you can find nixie tubes is in old scientific instruments, like this old HP 5321B frequency counter which has been converted into a clock. (It’s 10:53:49 PM.)

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