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Crazy professor conducting chemical experiments in the company of a little girls.
A typical representation that illustrates, testing the insulation resistance of an armature, with voltmeter and armature, vintage line drawing or engraving illustration.
Represents electrostatic induction, in which, the leaves will diverge, ever though the charged ebonite rod that does not approach to within a foot of the electroscope, vintage line drawing.
Chemist and Laboratory. Chemical experiment by a talented student. Vector illustration.
Funny little girl doing experiments in the laboratory. Explosion in the laboratory. Science and education.

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