Differential analyser
（重定向自Differential Analyzer）
![Ball-and-disc integrator for studying tides.](/Images/godic/202501/09/Harmonic_analyser_disc_and_sphere3550.jpg")
![Kay McNulty, Alyse Snyder, and Sis Stump operate the differential analyser in the basement of the Moore School of Electrical Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, c. 1942–1945.](/Images/godic/202501/09/KayMcNultyAlyseSnyderSisStumpDifferentialAnalyzer3550.jpg")
![A differential analyser at the NACA Lewis Flight Propulsion Laboratory, 1951](/Images/godic/202501/09/NASA_Differential_Analyzer3550.jpg")
![Early computer-and-plotter dating to 1944, solving complex equations again 70 years after.[23]](/Images/godic/202501/09/ImgAJ201412020061M-b3550.png")
The differential analyser is a mechanical analogue computer designed to solve differential equations by integration, using wheel-and-disc mechanisms to perform the integration. It was one of the first advanced computing devices to be used operationally.