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    Re: Centring Error Detector
    From: Brad Morris
    Date: 2014 Jan 20, 16:25 -0800

    Hi Frank

    Here's a 7 year old post that caught my eye.

    It describes a method that permits you to measure the arc error. It all makes sense to me but I'm trying to figure out how the prism is aligned to the optical path assigned to the horizon.

    Would you happen to have a copy of the patent?

    Alex,

    you mentioned that this equipment was offered by Heath and you had the catalog / book for it. Do you have it still?

    Brad
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