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    Re: Mathematical principle of Soviet dipmeter
    From: Bill Morris
    Date: 2012 Apr 17, 13:03 -0700

    Alex wrote
    "My question to those who know something about optical devices:
    did you know this?
    Is this used in any device that you know?
    (I am certainly not an expert in optics:-)"

    I suppose the principle is somewhat similar to that of the optical micrometer, which is used in many optical measuring devices to displace rays without bending them. I have attached a couple of pages from Habell, J K and Cox, A. Engineering Optics. London, 1953. These explain the principle.
    (I am not an expert in optics either...)

    Bill Morris
    Pukenui
    New Zealand
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