Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!purdue!decwrl!decvax!ima!mirror!frog!john
From: john@frog.UUCP (John Woods)
Newsgroups: sci.electronics
Subject: Re: wireless electricity
Message-ID: <1357@frog.UUCP>
Date: 2 May 89 22:45:00 GMT
References: <gYJRpyy00WB-E57Uwj@andrew.cmu.edu> <913@snjsn1.SJ.ATE.SLB.COM> <17794@cup.portal.com>
Distribution: na
Organization: Misanthropes-R-Us
Lines: 16

In article <17794@cup.portal.com>, ISW@cup.portal.com (Isaac S Wingfield) writes:
> Greg Wageman writes:
> 
> Hmm, I guess you must be too young to remember crystal radios?  These
> were radios that used a diode (originally, a germanium crystal and a
>                                              ^^^^^^^^^
> Nope. Iron pyrites (fool's gold).

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...
-- 
John Woods, Charles River Data Systems, Framingham MA, (508) 626-1101
...!decvax!frog!john, john@frog.UUCP, ...!mit-eddie!jfw, jfw@eddie.mit.edu