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@@ -549,4 +549,10 @@ The questions we are addressing here (and I take many of Frank's entries this wa \centerline{\picw=3.5in\inspic{harmanal.png}} \cskip \caption/f A precursor of the modern digital computer: replica of the Michelson-Stratton harmonic analyzer. Developed in 1989, the machine was capable of handling Fourier series of 80 terms. Fed the Fourier coefficients of a trigonometric series, it could produce a graph of the sum function and also perform the reverse process. (IBM) +\endinsert + +\midinsert +\centerline{\picw=3.5in\inspic{leibniz.png}} +\cskip +\caption/f Leibniz Calculator (IBM). \endinsert
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