Franklin swimming both myopia and hyperopia

When did Franklin invent swimming glasses
So he invented swimming fins; When he was a little older, he found that his eyesight decreased. He used both myopia and hyperopia. He didn't want to switch back and forth with two pairs of glasses, so he invented bifocal glasses. Franklin was a great inventor who invented bifocal glasses, lightning rod, odometer, urinary catheter, new street lamp, swimming fins and so onFranklin
Benjaminfranklin Benjamin Franklin -- the most perfect representative of capitalist spirit, the greatest American scientist, famous politician and writer in the 18th century. The most true portrayal of his life is the words he said, "honesty and diligence should be your eternal partner." January 17, 1706Benjamin Introduction to Franklin in English
Benjamin Benjamin Franklin (17 January 1706 - 17 April 1790) was born in Boston, Massachusetts, USA, an American political and physicist Benjaminfranklin (January 17, 1706 April 17, 1790) was bornIntroduction of Missy Franklin
Missy Franklin, an American female swimmer, is good at short backstroke and freestyle, nicknamed "female flying fish". At the age of 16, she won 3 gold, 1 silver and 1 bronze and broke the world recordAsk Franklin for information
Franklin won three gold medals when he first participated in the world tour, two more than Phelps. He was born in MAY1995. Place of birth: California. Current residence: Colorado. Height:
The anecdotes of Missy Franklin
As Franklin has dual nationality, his mother suggested that she represent Canada to avoid the strong competitive pressure in the U.S. national team. However, Franklin rejected his mother's proposal on the grounds that "I have such close ties with the United States." Franklin is 1.85 meters tall, above most female swimmersWhat was Franklin's childhood like
When he was 8 years old, his father got a job making candles for the church. As a result, little Franklin was able to go to a public Latin School. With his intelligence and willingness to learn, he became a good student with excellent results. Franklin liked swimming since he was a child. At the age of 5, he followed the instructions in the book swimming guideWhat is Franklin's life and all his inventions
Benjamin Franklin (January 17, 1706 April 17, 1790) (also translated as Benjamin Franklin, Benjamin Franklin), born in Boston, Massachusetts, USA, is an American politician and physicist. It is also a publisher and printerFranklin data
Benjaminfranklin is the first scientist, inventor and musician with international reputation in American history. In order to explore electricity, Franklin and other works (20 pieces) Suo once made the famous "Philadelphia kite experiment" and made remarkable achievements in electricity, in order to further explore the law of electrical motion