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    Re: Lunar trouble, need help
    From: Ken Muldrew
    Date: 2008 Jul 08, 09:58 -0600

    On 8 Jul 2008 at 11:21, George Huxtable wrote:
    
    > In the meantime, I wonder whether the text provided any more information
    > about that "pocket globe", a term that's unfamiliar to me. Does the text say
    > whether that was a balance-wheel and spring device, as had recently been
    > invented by Huyghens and Hooke (separately)? Did it have a minute-hand?
    
    It seems that the pocket globe was just a small globe with a case that opened up
    reveal the stars from a geocentric point of view. From the website:
    
    http://www.maphist.nl/ct/ct_11.html#111krogt
    
    "Until recently, the only known report on a pocket-globy by Abraham van Ceulen was
    an advertisement in the "Amsterdamse Couranto of April 20, 1697. The probability was
    put forward, that van Ceulen's pocket-globe was a re-edition of a small anonymous
    globe, ascribed to Blaeu (note 7). But, when the Amsterdams Historisch Museum
    acquired a copy of van Ceulen's pocket-globe, it appears to be a complete new
    engraved work. The engraving is done by Gerrit Drogenham. For the celestial globe
    the Blaeu 13.5 cm globe of 1606 was used as example. Because it is copied mirror-
    reversed, the result is the astronomically correct geocentric projection of the
    stars. The map on the terrestrial globe is identical to the mentioned anonymous
    globe, but has more toponyms on it."
    
    Ken Muldrew.
    
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