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What did Ben Franklin invent to help people with their sight?
Like most of us, Franklin found that his eyesight was getting worse as he got older, and he grew both near-sighted and far-sighted. Tired of switching between two pairs of eyeglasses, he invented “double spectacles,” or what we now call bifocals.
Which is Benjamin Franklin’s best known experiment?
Kite Experiment
Flying a kite in a storm was perhaps Benjamin Franklin’s most famous experiment that led to the invention of the lightning rod and the understanding of positive and negative charges. The connection between electricity and lightning was known but not fully understood.
What does Benjamin Franklin’s electrostatic machine do?
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. Franklin’s experiments with the machine eventually led to new theories about electricity and inventing the lightning rod.
What are Ben Franklin glasses?
Bifocals are eyeglasses with an upper and lower half, the upper for distance, and the lower for reading. Bifocals are commonly prescribed to people with presbyopia, a condition that Franklin suffered.
Did Ben Franklin invent glasses?
When you were in grade school, you might have learned that Benjamin Franklin invented “bifocals” and assumed that meant “glasses.” While Franklin did indeed invent bifocals in 1779, he did not actually invent glasses themselves – he merely created a version with multiple lenses that could help people with more …
What was the kite and key experiment?
Franklin’s experiment demonstrated the connection between lightning and electricity. To dispel another myth, Franklin’s kite was not struck by lightning. If it had been, he probably would have been electrocuted, experts say. Instead, the kite picked up the ambient electrical charge from the storm.