Which American president was an inventor? Detailed answer

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Which American president was an inventor? Detailed answer

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Which American president was an inventor?

Abraham Lincoln (1809-1865) was the only American president to receive a patent for an invention.

He came up with a device consisting of floats to raise the ship above the shoals. The patent and model of the invention (at that time applicants were required to submit a working model of their invention) were found in the US Patent Office's vaults and then displayed in a museum.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

What is the main ingredient in air?

a) Oxygen.
b) carbon dioxide.
c) Hydrogen.
d) nitrogen.

Nitrogen. As any twelve-year-old schoolboy knows, the proportion of nitrogen in the air is 78%.

Less than 21% of air is oxygen. And only three hundredths of a percent is carbon dioxide.

The high percentage of nitrogen in the air is the result of volcanic eruptions that occurred during the formation of the Earth. Huge amounts of this gas were released into the atmosphere. Being heavier than hydrogen or helium, nitrogen settled closer to the earth's surface.

A person weighing 76 kg contains 1 kg of nitrogen.

Nitre (In English nitrogen - nitrogen.) - the ancient name of saltpeter, or potassium nitrate. A key ingredient in gunpowder, saltpeter is also used to preserve meat, as a preservative in ice cream, and as an anesthetic in toothpaste for sensitive teeth.

For several centuries, organic mulch (humus) that seeped into the earthen floor of living quarters was considered the richest source of saltpeter. In 1601, the question of the unprincipled actions of the so-called "saltpeters" was raised in the English Parliament. They broke into houses - and even into churches - dug up the floors and sold the earth thus obtained for gunpowder.

The word nitrogen in Greek means "forming soda".

Beer cans with pressure-sensitive "bells and whistles" contain nitrogen, not carbon dioxide. Thanks to small nitrogen bubbles, the beer foam becomes smoother, thicker and juicier.

In addition to those already listed, the only significant gas in air is argon (1%).

It was discovered by the English physicist William John Strutt, Lord Rayleigh, he was the first to guess why are the skies blue.

Test your knowledge! Did you know...

▪ Are the temperatures the same at the North and South Poles?

▪ In what language is the capital of Austria called the Danube?

▪ Did Gogol gogol?

See other articles Section Big encyclopedia. Questions for quiz and self-education.

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Ohio University astronomers studying black holes in our galaxy, the Milky Way, have discovered what they believe is a new type of black hole - the smallest of any previously described in science.

Black holes form after stars die, collapse and explode, creating gravitational vortices so strong that even light cannot "escape" from them.

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That changed after a gravitational wave observatory called LIGO discovered two black holes merging into one in a galaxy 1,8 million light-years away. Two monstrous black holes were 31 times the mass of the Sun

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