spark transmitter

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Definitions from WordNet

Noun spark transmitter has 1 sense

spark transmitter - an early radio transmitter using a discharge across a spark gap as the source of its power
--₁ is a kind of radio transmitter

Definitions from the Web

Spark Transmitter

A spark transmitter is a device that generates and transmits electromagnetic waves through the creation and interruption of sparks within a circuit. It was commonly used in early wireless telegraphy systems.

Examples:

The spark transmitter revolutionized long-distance communication in the early 20th century.
He repaired the spark transmitter to ensure smooth communication across the radio waves.
She studied the principles of spark transmitters in her physics class.