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Planimeter [Newcomer] (1917)
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Mechanical Integrator [Newcomer] (1916)
The devices compute the integral or circumference of a drawn curve, when the pointer at the end is moved along the curve. The resulting linear and angular motions are converted into a readout, either a dial or a relative position of the device [information courtesy of Prof.~Erismann, Emeritus, ETH Zurich].MORE: Intergraph view a, view b, view c and view d; Planimeter view a and view b.
