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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.
The instrument consists of a glass tube of narrow bore, partially filled with some colored fluid which confines the air in the lobe, to which is blown a glass globe 3 to 4 inches in diameter, vintage
vector optical illusion, twisted abstraction, background of colored triangles

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