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Bifocals. A bifocal lens with areas of differing magnification. Bifocals with separate lenses. In this case, the Swedish ethnologist Jan-Öjvind Swahn [ sv]. Bifocals are eyeglasses with two distinct optical powers. Bifocals are commonly prescribed to people with presbyopia who also require a correction for myopia, hyperopia, and/or astigmatism .
Benjamin Franklin FRS FRSA FRSE (January 17, 1706 [ O.S. January 6, 1705] [ Note 1] – April 17, 1790) was an American polymath: a leading writer, scientist, inventor, statesman, diplomat, printer, publisher and political philosopher. [ 1] Among the most influential intellectuals of his time, Franklin was one of the Founding Fathers of the ...
Glasses. Glasses, also known as eyeglasses and spectacles, are vision eyewear with clear or tinted lenses mounted in a frame that holds them in front of a person's eyes, typically utilizing a bridge over the nose and hinged arms, known as temples or temple pieces, that rest over the ears. Glasses are typically used for vision correction, such ...
Franklin's electrostatic machine is a high-voltage static electricity - generating device used by Benjamin Franklin in the mid-18th century for research into electrical phenomena. Its key components are a glass globe which turned on an axis via a crank, a cloth pad in contact with the spinning globe, a set of metal needles to conduct away the ...
Advice to a Friend on Choosing a Mistress. " Advice to a Friend on Choosing a Mistress " is a letter by Benjamin Franklin dated June 25, 1745, in which Franklin counsels a young man about channeling sexual urges. Due to its licentious nature the letter was not published in collections of Franklin's papers in the United States during the 19th ...
The Way to Wealth. The Way to Wealth or Father Abraham's Sermon is an essay written by Benjamin Franklin in 1758. It is a collection of adages and advice presented in Poor Richard's Almanack during its first 25 years of publication, organized into a speech given by "Father Abraham" to a group of people. Many of the phrases Father Abraham quotes ...
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