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    Re: London Science Museum
    From: Alexandre Eremenko
    Date: 2012 Jun 27, 13:08 -0400

    Fred,
    Probably this is it:
    http://www.meccano.us/differential_analyzers/manchester_da/index.html
    
    Alex.
    
    
    > 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---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=119783
    >
    >
    >
    
    
    
    

       
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