obeť Vyššie uvedené úver experiment vacuum cleaner on static electricity illustration náboženstvo svätý tajomstvo
Cathode-ray tube - Wikipedia
Engraving of the first static electricity generator, designed by German scientist Otto von Guericke (1602-1686). Guericke was a German scientist, inventor, and politician. His major scientific achievements were the establishment of the
Experiments with electrical apparatus. Otto von Guericke (November 30, 1602 - May 21, 1686) was a German scientist, inventor, and politician. His major scientific achievements were the establishment of the physics of
How can a vacuum cleaner cause static electricity? - Quora