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  1. #1
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    A peek under the hood

    I was minding my own business when the doorbell rang and there was this kindly old gentleman with a pushcart on the porch. He asked me if I needed any knives sharpened or umbrellas fixed, and I didn't but I did ask him if he could do electron micrographs.

    Lo and behold, he whipped an EM out of his pushcart and said let me at it, so I did.

    Here is the result. It is a PM of my SRAD camera speed emulsion, mentioned elsewhere. It is a variant that I'm developing for high speed fine grain applications.

    As you see, it is about a 1 micron grain, rather monodisperse and consists of what I would describe as "rounded octahedra". It is just what I wanted to make and now I know exactly where I am and where I have been. I also know where to go next.

    So thanks to this kindly guy for doing it for me. He got away before I could get him to do more, but hopefully he will be back someday.

    My wife said that this looks like a convention of marshmallows.

    PE
    Attached Thumbnails Attached Thumbnails Electron  micrograph - BrI SRAD.jpg  

  2. #2

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    octahedra?

  3. #3

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    Very cool Ron. Kudos.
    Frank Schifano

  4. #4
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    Quote Originally Posted by rob champagne View Post
    octahedra?
    As in octagonal?

    http://www.google.com/search?hl=en&q=octahedron

    PE

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    Must be me then because I can see 6 angles round the edge which gives six faces and what looks like a top face which gives 7 faces on the visible side and assuming that is mirrored on the non visible side, then that would give 14 faces. An Octahedron only has 8 faces.
    On the other hand you may just be having another senior moment.

    Nice pic though...

  6. #6
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    Rob;

    Try this and see if it fits: http://en.wikipedia.org/wiki/Truncated_octahedron This as 14 faces.

    Nothing is perfect.

    PE

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    Thats better...

  8. #8
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    PE,

    This is very interesting. We can use photos like these as an example of what we could expect when building our emulsions.

    Thanks,

    Bob M.

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    Nicely done.

    Cheers,
    Clarence

  10. #10
    Michel Hardy-Vallée's Avatar
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    Yes, but was the EM also made on film?
    Using film since before it was hip.


    "One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal, Vol. 1 (8 Jan. 1819): 8-29. p. 11

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