[Jewelry making - Article 00021] - Re: [Orchid] Finding the centre of circle

[Al]

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    There is a tool called a Centre Square; like a jewellers square but
    the handle is a 90 degree vee with the blade bisecting the vee. Push
    the disc into the vee and the blade passes through the centre of the
    disc; scribe a line, rotate the disc and scribe another line, and you
    have the centre. You could make one that is small enough for jewelery
    purposes. Picture here: 

    http://garrettwade.com/jump.jsp?itemType=PRODUCT&itemID=100722

Alastair
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