mead107 Posted July 2, 2013 Posted July 2, 2013 I have a flash light that runs on no batterie.. Has button (lever) on it that you push several times to make it work.
ExiledInIllinois Posted July 2, 2013 Posted July 2, 2013 (edited) On 7/2/2013 at 11:17 AM, mead107 said: I have a flash light that runs on no batterie.. Has button (lever) on it that you push several times to make it work. It still has a battery. Just like the free plays (wind up)... When you push that button (or wind) you are charging the battery. This one appears to run soley on body heat? Edited July 2, 2013 by ExiledInIllinois
stevewin Posted July 2, 2013 Posted July 2, 2013 Not to take away from the ingenuity of the basic idea, but it looks to me that in practice (at least for now) it really isn't producing a strong beam of light to make a useful flashlight - it is just causing some low power LEDs to glow in the dark.
Chef Jim Posted July 2, 2013 Posted July 2, 2013 On 7/2/2013 at 4:15 PM, stevewin said: Not to take away from the ingenuity of the basic idea, but it looks to me that in practice (at least for now) it really isn't producing a strong beam of light to make a useful flashlight - it is just causing some low power LEDs to glow in the dark. ......a candle.
Fan in Chicago Posted July 2, 2013 Posted July 2, 2013 On 7/2/2013 at 11:10 AM, Beerball said: without batteries. Consider me skeptical but how can pure body heat produce enough energy to power a light bulb ? Also, after a bit of time, the air inside the flashlight will equate in temperature to the body and the temperature gradient will be lost. What am I missing here ?
BuffaloBill Posted July 2, 2013 Posted July 2, 2013 On 7/2/2013 at 4:08 PM, Gugny said: The hand can do many amazing things. I discovered this as a teenager also..... Though no flashlights were involved.
Beerball Posted July 2, 2013 Author Posted July 2, 2013 On 7/2/2013 at 5:33 PM, Fan in Chicago said: Consider me skeptical but how can pure body heat produce enough energy to power a light bulb ? Also, after a bit of time, the air inside the flashlight will equate in temperature to the body and the temperature gradient will be lost. What am I missing here ? That's what I was thinking too.
Gugny Posted July 2, 2013 Posted July 2, 2013 On 7/2/2013 at 9:18 PM, Beerball said: That's what I was thinking too, after reading your post. Fixed
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