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    Re: London Science Museum
    From: Gary LaPook
    Date: 2012 Jun 27, 01:08 -0700
    The Bygrave was not on display and I had to go to their storage facility several miles away to see it.


    --- On Wed, 6/27/12, eremenko@math.purdue.edu <eremenko@math.purdue.edu> wrote:

    From: eremenko@math.purdue.edu <eremenko@math.purdue.edu>
    Subject: [NavList] Re: London Science Museum
    To: NavList@fer3.com
    Date: Wednesday, June 27, 2012, 12:58 AM

    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:-)


    > 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 <eremenko---purdue.edu> wrote:
    > From: Alexandre Eremenko <eremenko---purdue.edu>
    > 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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