The Maxwell-Boltzmann distribution of particle speeds in a gas has been verified with an experiment, where particles are allowed to exit from a container through a small hole, and the particle beam then hits a rotating cylinder with a slit. The speed distribution can be solved from the hit signs in the interior of the cylinder. What about a similar experiment with electrons in a metal? If a metal is charged negatively, does it cause a small steady current of electrons flying out? Could the speed distribution of electrons in a metal be measured with a similar rotating cylinder trick? Has this experiment been carried out, or is there some difficulties that make the experiment impossible?