Q:
# What are some early counting devices?

**Two early counting devices were the abacus and the Antikythera mechanism.** The abacus and similar counting devices were in use across many nations and cultures. The Antikythera mechanism hails from the Greek island of Antikythera.

Credit:
Shin99½
Moment
Getty Images

Early evidence of abaci dates to 200 B.C. in China. The classic abacus consists of a number of rows of sliding beads on a frame with a horizontal beam dividing the frame into two unequal halves. The number of rows vary, but there are typically five beads below the beam and two above. An abacus is capable of performing addition, subtraction, multiplication, division, cube root and square root, and it is a much faster method of mathematics than writing calculations by hand. In fact, some parts of rural China still employ abaci in businesses, as electricity frequently fails and renders modern counting devices useless.

Over a century ago an unusual mechanism was found off the coast of the Greek island of Antikythera. It was thought to perhaps be an astrolabe or atomic clock, but its true use was unknown. It was called the Antikythera mechanism, and it has been extensively studied ever since. World class technology industries, such as Hewlett Packard, have worked on the mechanism. It is now understood to track various cycles of the solar system, and it operates as a sort of mechanical computer. The Antikythera mechanism is still under investigation and is considered to be the most complex piece of machinery from the ancient world.

Learn more about Math Calculators-
Q:
## What are some good calculators for math?

A: Some good math calculators are the TI-Nspire CX Cas, TI-84 Plus C Silver Edition, Casio Prizm, HP Prime and TI-89 Titanium. These calculators are capable o... Full Answer >Filed Under: -
Q:
## What is 178 centimeters converted to feet?

A: The length of 178 centimeters is equal to 5.84 feet or 70.08 inches. A length of 1 foot is equal to 30.48 centimeters or 12 inches. A meter is equal to 100... Full Answer >Filed Under: -
Q:
## How do you calculate percentage on a basic calculator?

A: Percentage can be calculated on a basic calculator by multiplying with the percent button. If the percent button is not present, the percent amount can be ... Full Answer >Filed Under: -
Q:
## How do thermal expansion calculators work?

A: Thermal expansion calculators input any known constants and the user-provided values of variables into the expansion equation and output the delta, the cha... Full Answer >Filed Under: