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    Bubble horizon
    From: Marc Bernstein
    Date: 2002 Dec 16, 15:49 -0500

    I assume most of us are using the "practice bubble horizon" sold by
    Celestaire. The key word here is 'practice'. It is not particularly easy to
    sight through and the bubble is quite wobbly. The main problem appears to be
    a lack of fluid dampening. Based upon my experience 7 minutes is not bad. I
    often get accuracies of 10-15 minutes. Maybe I need more practice.
    By the way if you hold a flashlight in just the right spot, it is possible
    to illuminate the bubble from the outside so you can use the practice bubble
    at night also. This only works with the Moon. There is not enough light
    transmission to sight a star, and no magnification.
    But for those of us who are landlocked it is still worth it.

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