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Heinrich Hertz's experiments of electromagnetic waves: demonstration proves James Clerk Maxwell's contention that a metallic surface should reflect electromagnetic waves
ARP23A15_263

Heinrich Hertz's experiments of electromagnetic wa...

An electromagnet used in a railway brake
ARP23A18_161

An electromagnet used in a railway brake

Magnetism and electromagnetism
ARP07103_460000352

Magnetism and electromagnetism

Paths of alpha, beta, and gamma rays from a radium sample
ARP07102_390005797

Paths of alpha, beta, and gamma rays from a radium...