Henry Ernest Dudeney/Puzzles and Curious Problems/348 - Blowing Out the Candle/Solution

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Puzzles and Curious Problems by Henry Ernest Dudeney: $348$

Blowing Out the Candle
Candles were lighted on Colonel Crackham's breakfast-table one foggy morning.
When the fog lifted, the Colonel rolled a sheet of paper into the form of a hollow cone, like a megaphone.
He then challenged his young friends to use it in blowing out the candles.
They failed, until he showed them the trick.
Of course, you blow through the small end.
Dudeney-Puzzles-and-Curious-Problems-348.png


Solution

The trick is to lower the funnel until the dotted line, $CA$, on the top in the diagram, is in line with the flame of the candle.
Any attempt to blow the candle out with the flame opposite the centre of the opening of the funnel is hopeless.


Proof


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Sources

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