What is this glass photo plate called?

[she_who_laughs]

I'm selling items of my brother's who recently passed away. He was into military, astronomy, geology, and photography, and a lot of his things are just baffling to me.  This plate glass thing looks like russion writing on the paper. I am wondering what it is called. You can see the picture of the soldiers when you move it at different angles...and some angles it looks black. Do you think the soldiers are Russions? Any help is appreciated. 

[chinohighcowboys1963]

It looks like a Magic Lantern slide.

 Have you tried holding up the paper to a mirror?  It does look like a foreign language,( not Russian).

[daveydempsey]

The printed words are reversed, looks like Latin

[argon38]

It is Italian, but doesn't seem to have anything to do with the glass plate. It's a limitation statement for a portfolio of etchings, saying how many copies were printed:

DELLA CARTELLA [I can't make sense of the rest of the line]

... DIECI ACQUEFORTI PIÙ...

...SONO STATI TIRATI SU CAR[TA]...

...NOVANTA ESEMPLARI NUMER[ATI]...

...[ESEM]PLARI NON [can't make out the rest]

OF THE FOLDER...

... TEN ETCHINGS IN ADDITION TO...

... HAVE BEEN DRAWN ON [some type of special] PAPER...

... NINETY NUMBERED COPIES...

... COPIES NOT...

I think it must just be waste card used as backing for the glass plate.

[sonomabarn67]

This looks like a glass plate negative to me.

[argon38]

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@sonomabarn67 wrote:

This looks like a glass plate negative to me.

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That was my first thought too, but I don't believe the image is a negative.

[debora_34_]

Not directly related to the image but...  GEAP (Grafiche Editoriali Artistiche Pordenonesi) began operating under that name in 1973.

Debora

[sonomabarn67]

Right, I didn't have my eyes open when I first saw it.

[maxine*j]

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@argon38 wrote:

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...  I don't believe the image is a negative.

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Definitely a positive image, but I can't make much of it.

[she_who_laughs]

Wow! Thanks everybody.  All the replies sure give me something to work with.  Really appreciate that I now have direction in which to further research.

I'll be posting another mystery (at least to me) shortly. 

[little.font.lord.leroy]

It is a glass plate positive.

The size may help determine it's use.

Grafiche Editoriali Artistiche Pordenones

seems they published history books, you may want to research them. This looks like a historical photo or copy of one.

Hard to say if this was something that they sold (as for class room/lecture slides) or something they owned, as in a positive of a negative somehow used in printing or layout? back light to see the image better, might show up best with a thin white paper behind held up to a strong light source to imitate a light box.