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Gene Fuller wrote:
"Terman certainly did not deny the existence of skin effect that keeps fields out of the interior of conductors.' true. The point is, shielding from magnetic fields is different from electric fields. On page 35 of his 1955 edition, Terman writes: "Magnetic flux in attempting to pass through a shield (copper or aluminum) induces voltage in the shield which gives rise to eddy currents. These eddy currents oppose the action of the flux, and in large measure prevent its penetration through the shield." On page 38, Terman writes: "Electrostatic shielding is obtained by enclosing free space to be shielded by a conducting surface." On page 45, is problem 2-45 which contains an illustration of a grid of open-circuit wires which "will provide electrostatic shielding without magnetic shielding---." This works just like the picket fences used in broadcast stations to inhibit harmonic transmission. Terman did not make this stuff up. It was already in wide use at the time. Best regards, Richard Harrison, KB5WZI |
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