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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 ...
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 ...
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 ...
Benjamin Franklin Drawing Electricity from the Sky, an artistic rendition of Franklin's kite experiment painted by Benjamin West, c. 1816. The kite experiment is a scientific experiment in which a kite with a pointed conductive wire attached to its apex is flown near thunder clouds to collect static electricity from the air and conduct it down the wet kite string to the ground.
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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