Photo Credits
Abacus, courtesy of Luis Fernandes (www.ee.ryerson.ca/~elf).
Soroban, courtesy of Luis Fernandes (www.ee.ryerson.ca/~elf).
Schickard’s calculator, courtesy of Benjamin Nill/Baron Bruno von Freytag-Löringhoff: Wilhelm Schickards Tübinger Rechenmaschine von 1623, Kleine Tübinger Schriften, 1986.
Pascal’s calculator, courtesy of J. A. N. Lee (ei.cs.vt.edu/~history).
Hard disk drive, courtesy of Seagate Technology, Inc.
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