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Function"Capacitors are widely used in electronic circuits for blocking direct current while allowing alternating current to pass, in filter networks, for smoothing the output of power supplies, in the resonant circuits that tune radios to particular frequencies and for many other purposes."
Taken from the following website.
Historical AttributesThis capacitator represents condensers both with paper and glass insulation that were made on a large scale and in numerous quantities in the Physics laboratory especially by Prof. Theodore Lyman and his work in the spectrum of arcs.
ProvenanceFrom the Department of Physics, Harvard University.