- A Sir William Thomson
- B Giovanni Plana
- C Pierre Jaquet-Droz
- D Vannevar Bush
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Answer:
D
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Explanation: Vannevar Bush and others developed mechanical differential analyzers starting in the 1920s. Sir William Thomson had discussed the possible construction of such calculators earlier but had been stymied by the limited output torque of the ball-and-disk integrators.
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