1. Ashlee Jenkins and Kailey Meadows

2. A calculator in which one must operate by hand to get mathematical information for a simple problem.

3. One that calculates, as: An electronic or mechanical device for the performance of mathematical computations. A person who operates such a machine or otherwise makes calculations.

4. The first of adding and subtracting machines so to speak. You could only add and subtract. Other functions had to be done more complicatedly. Derived from Latin. The abacus’ we know came form Rome, China, and India.

5. We know of him from his work with the triangle. Born 1623-1662. His machine also could only add and subtract.

6. Used Pascal's original ideas to develop his own calculator. Called it the Step Reckoner. Entered university at fifteen years old.

7. 1820 Thomas made a machine he called the arithmometer based of Leibniz design it could only perform four functions. Between 1820 and 1878 his machine sold about 1500.

8. Produced a key-driven adding machine in London in 1851 at the Crystal Palace Exposition.

9. Made in Germany by W. Feiler, G.M.B.H. Can print up to 999,999,999 characters. Made in the late 1970’s Produced in London One of the late Mechanical Calculators

10. These first calculators paved the way to the automatic calculators we use everyday. Without the hard work of many men which took over 200 years. These calculators even began the process of the computer because the first computers could only add and subtract. Without these first building blocks our world could have been very different.

11. http://www.diycalculator.com/sp-mechcalc.shtml http://www.vintagecalculators.com/html/calculat or_time-line.html http://www.vintagecalculators.com/html/calculat or_time-line.html http://www.xnumber.com/xnumber/mechanical1.htm http://www.xnumber.com/xnumber/mechanical1.htm http://mathsforeurope.digibel.be/Mechanicalcalc ulators.html http://mathsforeurope.digibel.be/Mechanicalcalc ulators.html www.vintagecalculators.com/html/mechanical_c alculators.html www.vintagecalculators.com/html/mechanical_c alculators.html