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Thread: Why does an orange fit in your hand?

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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by Bryn Mawr View Post
    I was under the impression that it was for the benefit of the partially sighted?
    Curve of constant width - Wikipedia, the free encyclopedia

    Famous examples of a curve of constant width are the British 20p and 50p coins. Their heptagonal shape with curved sides means that the currency detector in an automated coin machine will always measure the same width, no matter which angle it takes its measurement from. The same same is true of the 11-sided loonie (Canadian dollar coin).

    There exists a polynomial f(x,y) of degree 8, whose graph (i.e., set of points in R^2 for which f(x,y)=0) is a non-circular curve of constant width.[4] Specifically,

    f(x,y)=(x^2 + y^2)^4 - 45(x^2 + y^2)^3 - 41283(x^2 + y^2)^2 + 7950960(x^2 + y^2) + 16(x^2 - 3y^2)^3
    +48(x^2 + y^2)(x^2 - 3y^2)^2 + (x^2 - 3y^2)x[16(x^2 + y^2)^2 - 5544(x^2 + y^2) + 266382] - 720^3.
    That's exactly what you thought isn't it.

    It was probably true of the old Threepenny Bit as well (ah, yes, I remember them well).

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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by FourPart View Post
    It was probably true of the old Threepenny Bit as well
    Good lord no - it has to be a prime number of sides for it to work[1], the portcullis thruppence had an even number of sides, they were parallel. You could even twist them with a spanner. The earlier silver thruppence that went in christmas puddings was round.




    [1]: or odd, anyway. the prime number bit is intuitive guessing and possibly wrong.
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    Re: Why does an orange fit in your hand?

    Actually, the silver threepence came much later - introduced by Queen Victoria, before reverting to the original dodecagon.

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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by FourPart View Post
    Actually, the silver threepence came much later - introduced by Queen Victoria, before reverting to the original dodecagon.
    No no no - the twelve-sided coin was invented from scratch in 1937, it never existed before then.
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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by FourPart View Post
    Curve of constant width - Wikipedia, the free encyclopedia



    That's exactly what you thought isn't it.

    It was probably true of the old Threepenny Bit as well (ah, yes, I remember them well).
    That is certainly the mechanics of their construction and explains why they still work in a vending machine but why go to the trouble of making them that way in the first place?

    As I say, my understanding was that the underlying reason was to allow the partially sighted (not just the blind but those with, say, only peripheral vision) to pick out the coins more easily.

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    Re: Why does an orange fit in your hand?

    The 12 sided version was introduced in '37, but the 3d coin has been about since about the 17th Century.

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    Re: Why does an orange fit in your hand?

    What has any of this got to do with really big guys with Oranges?
    It may not be so much that I've conceded your point as that you just can't hear me rolling my eyes.

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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by FourPart View Post
    The 12 sided version was introduced in '37, but the 3d coin has been about since about the 17th Century.
    It was the "reverting to the original dodecagon" I was puzzled about.



    Quote Originally Posted by LarsMac View Post
    What has any of this got to do with really big guys with Oranges?
    Spanners, apparently. Ask the one from Gloucestershire.
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    From the upper tier of the Leppings Lane End of the Hillsborough Stadium, I watched the events of that day unfold with horror.
    When the flowers want to oxygen and nutrition, or you’re a wedding or party planner, I will help you too much.
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    Re: Why does an orange fit in your hand?

    Quote Originally Posted by Atlynox View Post
    Hello Coffee Shop,

    I wondered in my sleepy dreams that � was on a planet where the people were 3x times the size I am.
    (6 feet)
    And they had oranges that where 3x times larger than our oranges. I was still 6 feet.
    So I wondered: "Why does an orange fit in our hands?

    Or is this an out of topic discussion, on which one will I find some clues?

    Thank you!

    Atlynox
    This is the very reason why clementines and mandarins were invented.

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    Re: Why does an orange fit in your hand?

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    Because I've stuck the cucumber up my bum to keep my hands free.
    A dumb question deserves an intelligent answer.
    Any connection between your reality and mine is purely coincidental.

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