A peek under the hood

[Photo Engineer]

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

[rob champagne]

octahedra?

[fschifano]

Very cool Ron. Kudos.

[Photo Engineer]

octahedra?

As in octagonal?

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

PE

[rob champagne]

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...

[Photo Engineer]

Rob;

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

Nothing is perfect.

PE

[rob champagne]

Thats better...

[rmazzullo]

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.

[CRhymer]

Nicely done.

Cheers,
Clarence

[Michel Hardy-Vallée]

Yes, but was the EM also made on film?