What Is It? Game 64

Alex

Today's collaboration with What is it? blog brings us this strange device: what is it for?

Place your guess in the comment section - no prize this week, you're playing for bragging rights and fun only. For more clues, check out What is it? blog. Good luck!

Update 5/30/08 - the answer is: An automatic bookmark, it's clipped onto the back cover of a book with the pin placed between the pages to mark your place, patent number D163572.

Congratulations to Jim A. who got it right first!

Comments (24)

Newest 5
Newest 5 Comments

(NH4)2Cr2O7 is Ammonium dichromate which is sometimes called "Vesuvian Fire" as it was commonly used to simulate a volcanic eruption. I remember building ing a plaster of paris volcano model and making it erupt in my 6th grade class (circa 1967--yeah, I'm old)
The other compound is Mercury(II) thiocyanate (Hg(SCN)2) AKA "Pharoah's Serpent" It used to be used in fireworks because of its black-snake effect. However, it isn't readily available anymore because it is toxic.
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