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10 Jun 1752 Jahr - Invention of Bifocals

Beschreibung:

In 1752, Benjamin Franklin invented bifocals. Bifocals are glasses with transitional lenses that allow people who are both farsighted and nearsighted to maintain their vision with one pair of glasses, and while they have been upgraded, they are still used today.

Zugefügt zum Band der Zeit:

The American Journey

BySam Dorfman
16 Okt 2018
0
0
426

Datum:

10 Jun 1752 Jahr
Jetzt
~ 273 years ago

Abbildungen:

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