Bräcke is a municipality in north central Sweden, in the county of Jämtland. The municipality covers an area of 3453.8 km². Of the total population of 7577, 3901 are male, and 3676 are female. The population density of the community is 2 inhabitants per km².
... rev counters and light emitting diodes powered by a little generator embedded in the gyroscope.
The physics of this device looks confusing at first sight, but ...