When and why was the first periscope invented? Detailed answer

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When and why was the first periscope invented? Detailed answer

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When and why was the first periscope invented?

The first mention of the periscope is by no means associated with military use. In 1430, Johannes Gutenberg, better known as the inventor of printing, set up selling periscopes to pilgrims who were going to the traditional religious festival in Aachen so they could look over the huge crowds.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

What is stronger - web or steel?

The thread from which spiders weave the basis of their trapping web is thinner than a human hair, and its specific (that is, calculated per unit mass) tensile strength is higher than that of steel.

If we compare the gossamer thread with steel wire of the same diameter, then they will withstand approximately the same weight. But spider silk is 6 times lighter, which means it is 6 times stronger.

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