Lightning - 1942

An early documentary about the nature of lighting, its effects on electrical equipment and safeguards that may be used against it.
Understanding lightning. Protection of transmission lines. Formation of charged droplets in a cloud. Cloud-to-earth potential. Breakdown. Leaders and return strokes. Traveling waves on transmission lines. Reflected waves. Flashover. Oscillations in transformers. Shielded transformers. Effect of series inductance on transformer oscillation. Thyrite shunts to reduce oscillation. Valve-type lightning arrestors. Arrestor location. Pittsfield High-Voltage Laboratory. Lightning rods. Transmission line models. Thyrite arrestors. Flashover arcs. Expansion tubes for arc interruption.

[@IAmJimRetzer]

How odd to see a long-form silent instructional film from so late as 1942.

[@wizardofeyes]

Neat Video!. That looks like the big Marx generator from the 1939 NY World's Fair. Do you have any video of the the continuous 3 phase AC arc demonstration from that fair?
Thanks!