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    Re: London Science Museum
    From: Fred Hebard
    Date: 2012 Jun 27, 11:22 -0400

    Alex,
    
    Was that impressive piece Babbage's differential engine or another device?
    
    I know this is a bit off topic, but...
    
    Thanks,
    
    Fred Hebard
    
    
    On Jun 27, 2012, at 3:58 AM, eremenko@math.purdue.edu wrote:
    
    > 
    > Strangely, they do not show their Bygrave rule in the current
    > "Mathematical" exhibition,
    > though they show many slide rules, including cylindrical ones.
    > There is also a Troughton sextant looking exactly as the one that
    > belonged to Gauss (see an old discussion beginning with "Sextant in
    > German money").
    > 
    > The most impressive piece is a hudge analog differential equation solver,
    > which is a clockwork-type mechanism with shafts and wheels, occupying
    > a large room and served by no less than 20 people:-)
    > 
    > Alex.
    > 
    >> I visited that museum in 2009 and, by prior arrangement, also visited
    >> their storage facility and was allowed to examine and handle their Bygrave
    >> slide rule.�  See:
    >> 
    >> http://fer3.com/arc/m2.aspx/Manufacture-Bygraves-LaPook-aug-2009-g9378
    >> 
    >> gl
    >> 
    >> --- On Tue, 6/26/12, Alexandre Eremenko  wrote:
    >> 
    >> From: Alexandre Eremenko 
    >> Subject: [NavList] London Science Museum
    >> To: NavList---org
    >> Date: Tuesday, June 26, 2012, 9:20 AM
    >> 
    >> I recently visited the Science Museum in London.
    >> It has a Troughton dividing engine in a permanent exposition,
    >> but currently they also have two exhibitions:
    >> "Mathematics" and "Computers". In "Mathematics" exhibition they
    >> have many interesting items, I mean analog computers, various
    >> plotting devices and two other dividing engines, one of them WORKING!
    >> (What else can you display under the title "Mathematics" in a museum:-)The
    >> other dividing engines are another later one by Troughton,
    >> and one by Cary (London), which was used until 1920 and still working:
    >> in the museum display, you press a button, and an electric motor makes
    >> the parts of the engine move.Other very impressive things are differential
    >> analisers: pure mechanical
    >> devices for solving differential equations. It is amazing to see a high
    >> precision clockwork
    >> devices of such size:-)Alex.P.S. The very first Ramsden's dividing engine
    >> described in Bill Morris
    >> blog is in Smithsonian Institution
    >> in Washington DC. But I was never able to see it. Apparently it is not on
    >> display.
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    >> View and reply to this message: http://fer3.com/arc/m2.aspx?i=119778
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    >> 
    >> 
    > 
    > 
    > 
    > 
    
    
    
    
    

       
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