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Hewlett Packard HP-80 financial calculator. HP's first financial calculator which was produced shortly after the release of the HP-35 scientific calculator. Came in a high quality metal box.

Nachdem das Eis zwischen uns gebrochen war, erkundete Danbo direkt den Tisch und seine Neugier ließ ihn allerhand Fragen.

Besonders interessierte ihn der Taschenrechner und für was die vielen Knöpfe sind.

Ich versuchte ihm alles so einfach wie möglich zu erklären.

 

After the ice was broken between us, Danbo explored the desk. He was very curious and asked many questions.

Espicially the calculator seemed very interesting. He asked me about ALL buttons on it. What they do and why there are so many..

I tried to explain all to him!

A tax return form from 2011/2012

  

I am the designer for 401kcalculator.org. I have put all these images in the public domain and welcome anyone to use them however please credit our site as the source if you do:http://401kcalculator.org

From the Paul Graney Collection. This is Graney's pocket sized photographic handbook and diary 1939.

A study of calculator interfaces.

From the Paul Graney Collection. This is Graney's pocket sized photographic handbook and diary 1939.

Calculator @ the Church 12/21/12

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Calculator @ the Church 12/21/12

Vintage Burroughs Calculator not to portable at about 40 pounds but still working, found in North Carolina.

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

A study of calculator interfaces.

Scientific calculator that I was never aloud to use in school.

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Part of the display of calculators on show at the museum.

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

From the Paul Graney Collection. This is Graney's pocket sized photographic handbook and diary 1939.

Calculator @ the Church 12/21/12

A tax form and calculator

  

I am the designer for 401kcalculator.org. I have put all these images in the public domain and welcome anyone to use them however please credit our site as the source if you do:http://401kcalculator.org

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

A study of calculator interfaces.

favorite find at the sample sale today, fo' sure

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

Calculator @ the Church 12/21/12

This guy sold nothing but old scientific instruments. A whole table of beautiful slide rules if you're into that kind of thing. Here is an early calculator.

A display showing the evolution of handheld digital calculators over time, found at the Computer History Museum.

Calculator @ the Church 12/21/12

Inequality calculator is an online tool to find the value of X is greater or less than to a certain value. It is a tool which makes calculations easy and fun. If two inequality equations are given, then it can easily solve that inequality equation.

 

Just noticed. So many people type equations (simple & complex) into the search field that Google responded with the answer, and then some.

 

This is good for my iPad (which I took this screenshot on) as there is no calculator app on it.

 

Claire says it would be great if they made a scientific version so people wouldn't have to shell out so much money for the latest TI-nn.

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