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...n.png|thumb|alt=A line drawing of the valve|upright=1.4|Cross-section of a Tesla valve, displaying its cavity design, from the original patent application.] [[File:Nguyen Tesla flow visualization.webp|thumb|upright=1.4|Streakline flow visualization at ...

...nd produced a fundamental frequency of 12.5&nbsp;kHz, which was multiplied by 4 to give an output frequency of 50&nbsp;kHz.]] ...'Goldschmidt alternator''' or '''reflector alternator''', invented in 1908 by German engineer [[Rudolph Goldschmidt]],<ref name="Burns">{{cite book ...

...ile électrique à Napoléon en 1801.jpg|thumb|The [[voltaic pile]] presented by [[Alessandro Volta]] to [[Napoleone Bonaparte]]]] ...es or techniques invented, innovated or discovered, partially or entirely, by [[Italians]]. ...