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Be the first to guess what the pictured item is by leaving a comment below. If you have your own whatsit, our editors can include it in a future post. Please send an email to This email address is being protected from spambots. You need JavaScript enabled to view it. and attach a clear picture, the size and any markings. Hopefully, we will be able to identify it for our readers! 

The pictured item is 4 1/2 inches in diameter.

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#29 Answer from Kovelskovels.com 2019-06-14 09:07
This a ship’s prism. Position it with point down and insert it into the deck of a ship to provide light down below.
#28 Whatsitwednesda ynorcalgal 2019-06-13 14:49
Yes, I think this is too small to be a deck prism.......now I think it's a crystal paperweight for a desk.
#27 Paper weightiwantitbad 2019-06-13 14:33
It looks like a paper weight. Possibly Waterford Crystal? My Mom has one that lights when plugged in.
#26 What is it WednesdaySPal 2019-06-13 08:46
It's a deck prism.
#25 Deck prismflash472002 2019-06-12 21:56
I agree that it’s a glass prism that lets light into lower decks on a ship.
#24 RE: Happy #whatsitwednesd ay!Curlewqueen 2019-06-12 21:45
There was a sale of this prisms several years ago by the Public Broadcast network. The original ones were for light in the lower decks of sailing ships, really a unique way to get light below the deck.
#23 RE: Happy #whatsitwednesd ay!skatyeight 2019-06-12 21:20
A deck light or deck prism. It's a prismatic glass set into a ship's deck, to let natural light below. ... The earliest deck prisms with provenance are from the 1840s. ... the HMS Terror did not have portholes, but used Preston's illuminators instead.
#22 A glass lime juicerjoe0315 2019-06-12 18:45
Just give the point a twist inside of a half lime.
#21 light tileewenadamson 2019-06-12 18:08
I think it was too small for a deck prism - I think its part of a grating which would have 30 or more of these in a cast iron grid set in the pavement and would let light into basements. There used to be lots in London and presumably other cities.
#20 Ship prismmaxjones45 2019-06-12 17:25
It was sunk into the deck of a ship to allow light to enter the compartment immediately below.

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