John Napier
Cuisenaire and they are called rods and base 10 if white is one.
In 160 rods, there are 160 rods. This is a funny question.. ha ha ha. not.
these are a series of colored wooden "rods" - really, blocks - used to teach basic number theory and math skills. They were invented by Georges Cusinaire, a Belgian math and music teacher, in the 1950s. There are ten different "rods", all of which are the same height and width but they differ in length. Each one is one "unit" longer than the previous one, and each has a different color.
there are 320 rods in a mile
John Napier
in the 17th century
napiers bone
French Blaise Pascal invented the calculator. He did this to help his dad who was a tax adjuster. Then Gottfried Leibnitz improved on Pascal idea with a machine that would add, subtract, multiply, and divide. John Napierin invented the movable multiplication table engraved on a series of square section metal rods, called Napiers Bones.
Because he wanted a simple calculating device. (It's "bones" actually.)
napiers bone
in da 20th century.
Invented by Ben Franklin lighting rods are just what they sound like they are rods on a roof to take lighting instead of it hitting a house and burning it down.
Fishing rods were invented long ago, before records were kept.
Napier's Bones. It was a type of abacus.
I do not think so.
Benjamin Frankiln. To protect buildings from lightning