Mystery Science Image #2

by phill

I missed posting

this on Monday, but better late than never. This is actually five different images, all of the same instrument. Apologies for the crap quality, but you should still be able to guess what they are. You may even have used one of them recently, who knows? Here’s the only hint I’ll give: Galileo Galilei is thought to have been involved in its development, but not its invention. When you think you have the answer, click here to see if you were right and learn a bit about where they came from (and how science tends to work).

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