Fly swatter ham radio transmitter

[joeqsmith]

Article on early detectors.  I've never heard of most of these. 
https://earlyradiohistory.us/1917de.htm

[joeqsmith]

Homemade detector from a glass fuse, two brass inserts and a slurry of metal.  The grill starter will trigger it from across the lab with no antenna but my transmitter, with a clip lead attached, sitting next to it, will not trigger it. 

[joeqsmith]

Housing for the aerial current and reflected power meters.   

[joeqsmith]

Using a car ignition coil to power the latest transmitter.  Using my new Tecsun PL-990 portable receiver to determine how far we are transmitting.   Also shown is a demonstration of the home made cohere.   



Old movie showing using an X-ray machine as a transmitter to signal for help.  In the movies, it messes with every radio broadcast.  It's Hollywood..