2. First Calculators
The Abacus
• One of the first calculators
know to man
• Appeared in Asia Minor
2500 years ago.
• Memory Machine
• Based off the human hand
because there is 5 beadshttp://www.xnumber.com/xnumber/mechani
cal3.htm
3. Schickard’s Machine
• Add and subtract 6 digit
numbers
• Created by Wilhelm
Schickard in 1623
• Used a wheel that would
rotate one tenth of a full
tern
http://www.xnumber.com/xnumber/
mechanical2.htm
4. Leibniz Stepped Drum
• The first machine which
could execute all 4
arithmetic functions
• Created by Gottfried
Wilhelm Von Leibniz in 1672
http://www.xnumber.com/xnumber/mechanical2.htm
5. Troncets or Slide Adders
• This was a abacus but
instead of using beads it
was replace by a sliding bar
• Created by J.L. Troncet in
1888
http://www.xnumber.com/xnumber/mechanic
al2.htm
6. William Seward Burroughs
• Created by William Seward
Burroughs between 1880
and 1884
• It included a full keyboard
and printing skills
• Made for the financial
workers in businesses
7. Dorr Felt’s Comptometer
• Created by Dorr E. Felt in
1886
• Used a full keyboard which
listed the numbers and by
pushing the numbers and
pulling the lever it would
computehttp://www.xnumber.com/xnumber/mechani
cal3.htm
8. The beginnings of the 10-key machine
• Created by James I. Dalton
in 1902
• It had two rows of 5 digits in
each
• Not easy to use and was
time manageable
http://www.xnumber.com/xnumber/mechani
cal3.htm
9. The Victor Adding Machine Co.
• Created by Carl Buehler in
1923
• The first one used a full
keyboard similar to the
Comptometer
• Later it was improved with
printing capabilities
http://www.xnumber.com/xnumber/mechani
cal3.htm
10. The First Mechanical Binary Computer
• Created by Konrad Zuse in
1936
• First Binary Computer
• Its memory consisted of
metal plates instead of
memory chips
• Consisted of 64 words in 3
storage blockshttp://www.xnumber.com/xnumber/mechani
cal3.htm
11. The Curta, a Mechanical Wonder
• Created by Curt Herzstark in
1943
• It had a four function
calculator close to the
Guass
• It is nicknamed the pepper
grinder
http://www.xnumber.com/xnumber/mechani
cal3.htm
12. Microprocessor
• Created by Dr. Marcian
"Ted" Hoff in 1970
• The first one was a 4 bit
microprocessor
• This brought us to the
calculators we know today
http://www.xnumber.com/xnumber/mechani
cal4.htm
13. Timeline of Calculators
First Calculator
Modern Calculator
http://www.wired.com/reviews/product/t
exas_instruments_ti_89_tit
14. Reference Page
• Emotional Video Unity, . (2007). Square root of 2 on the pepper grinder. Retrieved
from
http://www.vidoemo.com/yvideo.php?i=aGFhQ29WcWuRpckdkNms&square-root-
of-2-on-the-pepper-grinder
• Redin, J. (2007, November 22). A Brief history of mechanical calculators. Retrieved
from http://www.xnumber.com/xnumber/mechanical1.htm
• Redin, J. (2007, November 22). A Brief history of mechanical calculators. Retrieved
from http://www.xnumber.com/xnumber/mechanical2.htm
• Redin , J. (2007, November 22). A Brief history of mechanical calculators. Retrieved
from http://www.xnumber.com/xnumber/mechanical3.htm.
• Redin, J. (2007, November 22). The Calculator and the birth of the microprocessor.
Retrieved from http://www.xnumber.com/history_pages/history4.htm
