KnowraSpark-gap transmitterLinked fromLinked fromThe 7 pages that link to Spark-gap transmitter, each with the reason it gives.All 7Broader topic 4Related 1Compared with 2Wireless telegraphyBroader topic: This early transmitter produced the damped waves used in the first wireless telegraph systems.Guglielmo MarconiBroader topic: Marconi used spark-generated waves to send Morse-code signals.Oliver LodgeBroader topic: Lodge used spark discharges to produce waves in laboratory demonstrations.History of radioBroader topic: Early wireless telegraphy relied on spark transmitters, which sent crude, broadband signals.