Relaxation box

This box is a set of nine relaxation oscillators. It blinks random patterns and looks cool. When the voltage on the capacitors charge to 65 volts, the neon gas ionizes and discharges the capacitors to 55 volts. The frequency can be simply calculated from the exponential RC function, assuming that the discharge time is neglible to the charging time.
Relaxation box - schematic

In 1968, 45 volt, and 67 1/2 volt batteries were easier to get. I recently bought a set of 45 volt batteries from Newark. If the batteries are fresh, they will last their shelf life, which is usually 5 years. Notice that there is no off-on switch, so the

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