G'morning David, 

 DW> But if the barometer is a real Torricellian one, with an extremely long
 DW> evacuated tube above the mercury, then with some ingenuity it should be
 DW> possible to drop something in the vacuum....

An extremely well-endowed barometer, in other words !

 DW> This would be something that could be done with a
 DW> barometer but not, for example, with a sledgehammer, would make better
 DW> sense of the question.

Yes - use of the barometer is a must...

:-)

 
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