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    Re: Ebbco in Yonkers
    From: Hewitt Schlereth
    Date: 2014 Aug 8, 21:46 -0700
    Greg, that's pretty much my experience with Ebbco on land. The first two years I navigated at sea ('72, '73) were with an Ebbco. (See cover of Commonsense Celestial).

    As you say, adjusting them is a pain - Davis' thumb screws are far superior. Whatever you do, don't lose the minuscule Allen wrench. I did and finally had to buy another sextant on eBay just to get the wrench. 

    The other problem with the Ebbcos is after awhile (3-5 years) the shades go opaque.

    Lately I've been trying a recent-model Davis Mk3 and am getting about the same results with it as I do with my Davis Mk15 and Ebbco. I've noticed the IE on the Mk3 holds steady (2' on) thru rounds of 5-7 sights, and between one trip to the shore and the next. May be due to the light color of the Mk3 not absorbing the heat rays, or may be because my Mk15 and Ebbco are old and have been used a lot. Having metal worm screws traversing plastic racks has to put a lot of uneven wear on the racks.

    Hewitt

    On Aug 8, 2014, at 8:11 PM, "Greg Rudzinski" <NoReply_Rudzinski@fer3.com> wrote:

    This evening from Yonkers N.Y. I have taken 6 observations of the Moon in an artificial horizon using an Ebbco plastic sextant. Adjusting the index and horizon mirrors was on the difficult side using a small hex wrench. Determining index error was also difficult because of an unexpected large spread in index error values (5'). I went with the average which was 3' on the arc. The scope which has plastic lenses worked better than expected showing detailed features on the Moon. The most serious issue were 2 ghost images showing along with the bright reflected image. This didn't seem to affect function though. The spread of 6 intercepts was 5' with an average of 1.3' toward. Performance is well behind my Tamaya and Plath metal sextants which regularly have spreads of no more than 1' for a set of observations when using an artificial horizon. Never the less the plastic Ebbco finds a place in my sextant inventory as a good enough , compact, light, and inexpensive sextant. $35 should bag a good one on Ebay.

    Greg Rudzinski  

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