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 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. Lindsay Publications