Translation of the Facebook description of the photo:<p>&quot;[...] Yesterday I stumbled upon a service company that balances driveshafts. You won&#x27;t believe what the owner uses to compute the mass of the weights. The system is based on a homemade bench for balancing shafts connected to a generator of sinusoidal alternations and piezoelectric sensors that measure the vibrations of the rotating shaft. The photo should give you a hint. The thing has been working uninterrupted for the last 25 years, even though the computer at some time had been flooded through a leaky roof window and apparently shit at by pigeons. The program was developed in-house. And it works, gentlemen. It works!&quot;