Wilhelm Schickard's "Calculating Clock"Wilhelm Schickard invented the first calculator in 1623 AD. It is able of multiplying large numbers.
Why: Because it started the whole idea of calculators
Blaise Pascal's PascalineA calculator that could perform addition and subtraction; however, only pascal could keep it working properly. It was also terribly expensive.
Why: Another calculator was made but with different funtions Why:
Samuel Morland's Mechanical CalculatorSamuel Morland inproved Pascal's version of a calculator that would be easier and more efficient to use.
Why: Calculators were made easier to use increasing use
Gottfried Leibnez' "Stepped Reckoner"Gottfried Leibnez invented calculus by making a calculator that could both add and multiply.
Why: Now you don't need two calculators just one
Thomas de Colmar's ArithmometerThomas de Colmar invented the first mass-produced and mass-sold calculator. Continues to be used and sold for many years.
Why: Calculators could be found and used easier to the masses
TelegraphThe telegraph was invented
Why: Communication over distances was made quicker
First ProgrammerLord Byron's daughter, Ada, Countess of Lovelace suggested to Babbage to program his analytical engine becoming the world's first programmer.
Why: People were becoming more interested in computers
Scheutz' Printing CalculatorThe first printing calculator was invented.
Why: People could print off and show their work to others
Trans-continental TelegraphA trans-continental telegraph line connects the Atlantic and Pacific coasts
Why: Communication was spread all over the US
TelephoneAlexander Graham Bell invented the telephone
Why: People made it even easier by making it so the common people who didn't know how to use a telegraph could still communicate.