From: utzoo!decvax!yale-com!leichter Newsgroups: net.physics Title: Re: perpetual motion puzzle? Article-I.D.: yale-com.661 Posted: Mon Jan 17 13:16:45 1983 Received: Wed Jan 19 19:54:59 1983 References: fortune.726 The clocks I've seen with hands attached to pieces of clear plastic - actually, glass in all the one's I've seen - are actually very simple: There are two pieces of glass, and the glass itself rotates! Each hand is attached to the appropriate piece of glass. One can also be clever and hang a low-friction bearing on the glass & drive a couple of gears - so one piece of glass can drive several hands. -- Jerry decvax!yale-comix!leichter