discoveries
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discoveries [2021/05/26 10:45] rapidplatypus [Hiram Bingham III] |
discoveries [2021/08/12 05:58] (current) piotr |
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| ==== Refraction in the atmosphere ==== | ==== Refraction in the atmosphere ==== | ||
| - | In 1761 astronomers had only telescopes at their disposal. During the final phase of the transit of Venus Mikhail Lomonosov observed an arc of light on the side of the planet that was no longer directed against the background of the Sun. He explained this phenomenon by refraction in the atmosphere. [([[https:// | + | In 1761, astronomers had only telescopes at their disposal. During the final phase of the transit of Venus, Mikhail Lomonosov observed an arc of light on the side of the planet that was no longer directed against the background of the sun. He explained this phenomenon by refraction in the atmosphere. [([[https:// |
| ==== The prototype AC generator ==== | ==== The prototype AC generator ==== | ||
| - | The prototype AC generator was built in France, almost immediately after the discovery of the phenomenon of electromagnetic induction. It was built in 1832 by the mechanic Hippolyte Pixii. It is an electrical machine that converts mechanical energy, drawn from an external device that drives the alternator, into electrical energy in the form of alternating current. [([[https:// | + | The prototype AC generator was built in France almost immediately after the discovery of the phenomenon of electromagnetic induction. It was built in 1832 by the mechanic Hippolyte Pixii. It is an electrical machine that converts mechanical energy, drawn from an external device that drives the alternator, into electrical energy in the form of alternating current. [([[https:// |
| ==== Appearance of the periodic table ==== | ==== Appearance of the periodic table ==== | ||
| - | The modern appearance of the periodic table is due to Niels Bohr, who divided it into groups and periods. Groups are usually written in columns and periods in rows. Groups are divided into main groups and side groups. In main groups, periods occur every eight consecutive atoms, which is because there are exactly | + | The modern appearance of the periodic table is due to Niels Bohr, who divided it into groups and periods. Groups are usually written in columns and periods |
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discoveries.1622043943.txt.gz · Last modified: 2021/05/26 10:45 by rapidplatypus