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    Self made horizon mirror, Freiberger style, was: first mirror artifical horizon test
    From: Wolfgang Hasper
    Date: 2011 Mar 31, 11:38 -0700

    Some time ago I made a horizon mirror sin only relatively simple tools:
    A drill press, two sizes of hole saws, drills, tapping equipment

    The mirror cell follows te Freiberger mirror in dimensions
    ~ 125 mm dia over all
    100 mm dia mirror

    I used hole saws of 105 mm and 127 mm to cut ot a circular base and a ring from 5 mm aluminim, srewed togerther with M3 brass screws

    3 more brass screws with tpped ends are uses for levelling. M3 has sufficiently fine pitch.

    The mirror bears on 3 steel balls ~ 4 mm dia from a ball bearing and is held in place by another 3 opposing smaller balls in simple plastic springs.

    The mirror cost around 25 €, the rest next to nothing, ~ 6 hors of work.

    You only need a good grade spirit level, considerably more expensive and small & light enogh to fit onto the mirror.

    c.f. linked photos

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