The differential analyser, a mechanical analog computer designed to solve differential equations by integration, used wheel-and-disc mechanisms to perform the integration. In 1876 Lord Kelvin had already discussed the possible construction of such calculators, but he had been stymied by the limited output torque of the ball-and-disk integrators. In a differential analyzer, the output of one integrator drove the input of the next integrator, or a graphing output. The torque amplifier was the advance that allowed these machines to work. Starting in the 1920s, Vannevar Bush and others developed mechanical differential analyzers. COUNT 4
QSN1 What type of mechanisms did the differential analyzer use? ANS1 wheel-and-disc QSN2 In 1876 who lobbied for the construction of the differential analyzers? ANS2 Lord Kelvin QSN3 During what decade were mechanical differential analyzers developed? ANS3 1920s QSN4 In the 1920s, who was the person who developed mechanical differential analyzers? ANS4 Vannevar Bush