Tesla's records indicate that the device is based on a narrow stream of small tungsten pellets that are accelerated via high voltage (by means akin to his magnifying transformer).
transmitter | Transmitter | Spark-gap transmitter | Nauen Transmitter Station | Denizköy VLF transmitter | Wilsdruff transmitter | Venets Transmitter | Sottens transmitter | Rø Transmitter | Ravensburg-Horgenzell transmitter | Ochsenkopf Transmitter | Mobile Infrared Transmitter | Marnach transmitter | Magnifying transmitter | magnifying glass | Bod Transmitter |