Experimental Crystal Set Receivers by Modern Electrics
Here are hints, tips and secrets extracted from the Experimental Department of Modern Electrics magazine, all sent in by builders of crystal sets pre the First World War.
Items include A Galena Detector, How to Make an Exhausted Coherer, Leyden Jar Condenser, How to Make a Sensitive Galvanometer, A Loose Coupler, A Silicon Ticker, Variable Condenser (lots on those), A Flame Audion, Perikon Detector Stand and more - 74 in all, most illustrated.
This looks like great stuff, rather like Pete Friedrichs' Voice of the Crystal if it had been written nearly a hundred years ago!
48 landscape format pages. Softcover.