Businessman running away from huge pendulum with message 'tax', financial crisis in tax burden concept. 债务 公司业务 人民 Tax pendulum
The French physicist Léon Foucault (1819 - 1868) in 1851 could prove with the help of a long string pendulum (Foucault pendulum) and a fixed mass of the Earth's rotation in a pendulum experiment for the first time vividly. The illustration shows a subsequent attempt in the 2nd Half of the 19th Century. Woodcut engraving, published in 1877. 福柯 摆 历史 Foucault pendulum
Silver and quartz crystal on clear crystal wand with bokeh lights background. 恢复 魔术棒 魔术 Quartz Crystal Pendulum