The spark gap signal that changed ANZAC history

Did you know there was an Australian Submarine manned by Australians, Brazilians, British and yes a New Zealander. Click HERE to read an interesting article published in Amateur Radio Magazine. This article was first published by The Wireless Institute of Australia which is the national association for amateur radio in Australia.  Founded in 1910 it is the first and oldest national amateur radio society in the world. https://wia.org.au   Thanks. Frank