At 1:06 pm -0500 17/4/07, Ron Nossaman wrote: >>I suggest you do some reading and get your facts straight before >>you contradict the laws of nature. >> >>JD > > >Sage advice from the man who insisted on this list that the tin can >and string telephone he made as a kid worked with the string slack. Are you sure I didn't say knitting wool? Putty perhaps? For the benefit of those whose memory is as faulty as yours, or who have no reason to remember at all, here is part of this ancient exchange: At 1:40 pm +0000 22/1/02, John Delacour wrote: >Here's a "neat little experiment", as the fashion is, quoted from >the first chapter Lord Rayleigh's "Theory of Sound" (quite a pretty >little tome of some renown): > >>7. The conveyance of sound by solids may be illustrated by a pretty >>experiment due to Wheatstone. One end of a metallic wire is >>connected with the sound-board of a pianoforte, and the other taken >>through the partitions or floors into another part of the building, >>where naturally nothing would be audible. If a resonance-board >>(such as a violin) be now placed in contact with the wire, a tune >>played on the piano is easily heard, and the sound seems to emanate >>from the resonance-board. [Mechanical telephones upon this >>principle have been introduced into practical use for the >>conveyance of speech.] > >Now I suppose you are going to tell me that the sound-board of the >pianoforte moves the wire threaded through the building and the wire >threaded through the building moves the resonance-board or violin >plate, and that this it does directly. > >I have previously mentioned the cocoa-tin telephones of my childhood >with no reponse, but you'll probably find Wheatstone and Rayleigh >less worthy or your contempt. At 10:01 am +0000 6/1/02, John Delacour wrote: >When children stretch a wire between two cocoa tins and create a toy >telephone... JD
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