And also, what was it used for? When was it introduced?
Most detailed answer gets 10 points
What is the name of that circular metal object that doctors used to wear above their heads?
Headlamp.. I guess it was introduced about when someone invented the small lightbulb.. about..eh.. 1910?
http://www.fotosearch.com/CRT215/001720a...
http://images.google.no/images?q=surgica...
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