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    Re: Red knob on micrometer
    From: Roger Harris
    Date: 2014 Jul 1, 20:38 -0700

    The adjustable micrometer drum is common to C&P's higher-end sextants, viz. the "Bobby Schenk", "Polaris", and "Horizon Ultra".

    It's curious that the sextant's owner did not know what this feature was, as it is described in C&P's catalogue and instructions for its use are of course included in the relevant "operations manual" (e.g., page 10 of the Horizon Ultra's manual).

    If memory serves me correctly, the quick-adjust drum cannot be retrofitted on C&P's standard "Professional" model, which is equipped with a plain non-adjustable drum.

       
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