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    Re: Star-star distances for arc error
    From: Gary LaPook
    Date: 2009 Jun 27, 04:21 -0700

    My SNO-T seems to work well without one.
    
    gl
    
    On Jun 26, 9:16�pm,  wrote:
    > Jim, you wrote:
    >
    > "As noted, readings to 0.1' can be done without a vernier, so why have
    > one?"
    >
    > Marketing! :-) Users like them and expect them, whether for rational reasons or not.
    >
    > Just about four years ago, I wrote:
    > "I've also noticed that some Plath sextants don't include a little vernier 
    scale for reading off tenths of minutes. But in practice, I find that this 
    �matters relatively little."
    >
    > And Joel Jacobs, who sells sextants, had replied:
    > "Thank you for saying that.
    > Some people think they are getting short changed when there is only the 
    index and no hash marks. It should make no difference since you can visually 
    estimate with great accuracy the intermediate reading."
    >
    > And seriously, he had a nice Plath sextant, if I remember correctly, that 
    was turning off some customers because it didn't have that little micrometer 
    vernier.
    >
    > -FER
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