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https://flic.kr/p/PqBWPG | 03apr16 the 3rd brother by SPARK GAP NORTH NN2 | XX

Spark gap radio transmitter in American Museum of Radio & Electricity in Bellingham, Washington, USA. The placard reads: "Spark-gap transmitter. Radiguet & Massiot, French c. 1900. Small spark transmitter used for ship to shore communication. Range was about 10 km."

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from Hackaday

Low-Voltage Tesla Coil Uses a Relay Instead of a Spark Gap

[Teodor] writes in with a unique Tesla coil he designed and built. Unlike most Tesla coils, [Teodor]'s design is able to run with a fairly low input voltage because it doesn't use a static spark gap l...

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