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Tilted Cat Head
Administrator
Location: Manhattan, NY
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hmmm... answers that...
Quote:
David Creates a Water-Sphere Lens:
Monday May 1st, 11 am (two hours before David would enter the tank) Just two hours before David would enter the tank, all was going smoothly until David's crew smelled a faint trace of smoke. Then they noticed that the metal in a certain section of the tank's platform was warped. Tom Bramlett, who designed the tank, guessed correctly what was going on. He placed a box of kitchen matches over the warped metal and it caught on fire. The "human aquarium" created for David was also a highly-functional water-sphere lens, much to everyone's surprise. Tom's crew coated the bottom of the sphere with reflective material to disable the sphere's ability to focus light. The same principle which allowed the sphere to burn the box of matches allows those with enough patience and skill to light fires on sunny days using a magnifying glass. David's sphere simply became a huge magnifying glass in the middle of the Plaza.
For a simple description of how to make a water-sphere lens:
http://www.exploratorium.edu/snacks/...here_lens.html
For a more scientific explanation:
http://www.physicsclassroom.com/Class/refrn/U14L5a.html
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