Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!lll-winken!uunet!tektronix!zephyr!vice!georgep From: georgep@vice.ICO.TEK.COM (George Pell) Newsgroups: sci.electronics Subject: Crystals (was Re: wireless electricity) Keywords: crystal catwisker razor blades Message-ID: <3569@vice.ICO.TEK.COM> Date: 6 May 89 18:33:47 GMT References: <913@snjsn1.SJ.ATE.SLB.COM> <17794@cup.portal.com> <1357@frog.UUCP> Reply-To: georgep@vice.ICO.TEK.COM (George Pell) Distribution: na Organization: Tektronix, Inc., Beaverton, OR. Lines: 24 In article <1357@frog.UUCP> john@frog.UUCP (John Woods) writes: > (stuff about crystal radios) > >Also sometimes a crystal of galena (lead sulfide?). > >I remember reading in a really OLD book of kid's science projects about ^^^ >how you could use a rusty disposable razor blade and a bent safety pin >as a detector... (I'm not OLD, you must just be YOUNG) The disposable razor must be a 'blue blade'. I built one of these when I was a kid. The platinum type won't work. Does anyone know of a source for galena crystals? A person I bumped into at a book store was looking for one, and I called around. Seems that the last source known to Portland Radio has stopped making them. Am I the owner of the last galena crystal on earth?? geo (only 40 and counting)