One thing that I recently discovered, is that Ring Laser Gyros actually WEAR OUT with time, within about 15-20 years. It's not a joke, being fundimentally a gas 'discharge' tube, apparently eventually the lasing surfaces degrade with time.
I was gobsmacked when I discovered that one. (It seems that fibre optic LGs do not suffer the same fate, at least so far
).
Dude
