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Benjamin Franklin invented, among other things, bifocal glasses, a much-improved wood stove and an effective mail service.
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What are two impotant things Benjamin Franklin did?
He invented bifocals and the lightning rod.
What is one of Benjamin Franklin invention?
one of ben franklins is the bifocals because he didn't want to keep having two glasses around his neck and keep switching them
What did Benjamin Franklin invented to make him a inventor?
Two useful and well known inventions of Benjamin Franklin include the Franklin stove and the lightening rod. Also, Ben Franklin invented the glass harmonica and bifocals.
How did the mesopotamia control flooding?
what are two things summerians invented
Who is dudeney what they invented?
Henry Dudeney has invented two things. Henry Dudeney invented logic puzzles and mathematical games.
What year was the bifocals invented?
The bifocals were invented in 1784, by Benjamin Franklin, because he had seeing problems, and put two lenses of glass together to magnify his vision.
When were eye glasses invented?
The very first eyeglasses were invented in 1286, but many later developments were made that improved on the initial designs. Benjamin Franklin invented bifocals, glasses with two distinct optical powers, and George Airy invented lenses correcting astigmatism.
List two things that Franklin D. Roosevelt wanted to send the allies.?
Warships and Airplanes.
What two things did Henry viii change?
he invented the church of england(and divorce)
What can you use to gets things off of high shelves?
The Franklin Long arm, which has a long pole, and a sort of U-shaped two cupped grasping devices at the top, and usually two lever grips to actuate the Spring-loaded arm. Franklin invented this device in Colonial times- still in everyday use in many stores. It is a funny thing for drawing practice, hard to draw shape.
What is the number of Benjamin Franklins inventions?
Benjamin Franklin had a number of inventions, but never patented a single invention. Some of the more memorable Franklin inventions are the bifocal glasses, the Franklin stove, lightening rod, long arm reaching device, glass harmonica, political cartooning, odometer, swim fins, and urinary catheter.
What major things did Einstein invent?
Two major things Einstein invented was the atomic bomb and E=mc2 BY THE WAY : (the two is supposed to be squared)
