One of my technical journals had a special article every April issue. One year featured the “Dark Emitting Diode” or D.E.D. Another year it was the Flame Emitting Diode.
In the movie ‘Soldier of Fortune’ (with Clark Gable) a little girl posits the theory that one could gather up a big bag of dark night air and then let it out in the daytime when a nap is necessary.
A type of flashdark is actually (seriously) possible, and anyone can make one, using common household materials:
Tear a piece of aluminum foil off its roll, then poke a small hole through it, using a pin (just as you would to make a pinhole camera—such pinhole devices are also used to project an image of the Sun onto a white screen or piece of paper, for observing sunspots or solar eclipses), and:
If you hold the aluminum foil containing the pinhole facing a bright indoor or outdoor background (even toward the Sun itself, but don’t point it directly at the Sun!) and look through the hole, you should see a tiny black disc in its center—this is where light rays of opposing phase are cancelling each other out, creating darkness. In “The Second Book of Experiments” by Leonard de Vries, there is an acoustic home experiment which demonstrates how two sound sources—if the sound waves they produce are properly “in-step” (or out of step)—will cancel each other out, producing silence. He also mentioned that two similarly-arranged light sources produce such mutual wave-cancellation, and thus darkness.
almost 6 years ago
Ooh, a flashdark. I gotta get me one of those.
sbferg almost 6 years ago
Horace must have visited Xanth recently.
Fred almost 6 years ago
are these available on Amazon?
Plods with ...™ almost 6 years ago
Horace has gone to the Dark Side?
I bet he heard they had cookies too.
Huckleberry Hiroshima almost 6 years ago
We used to call shadows flashdarks.
Greyhame almost 6 years ago
A flashlight is actually a darksucker.
One of my technical journals had a special article every April issue. One year featured the “Dark Emitting Diode” or D.E.D. Another year it was the Flame Emitting Diode.
J Short almost 6 years ago
Allows you to take a dim view.
scyphi26 almost 6 years ago
Well…something else to add to my Christmas wishlist.
Cerabooge almost 6 years ago
What happens if Horace “shines” the flashdark on himself?
codedaddy almost 6 years ago
Clever idea. Plus it recharges the batteries as it absorbs the photons.
chris_weaver almost 6 years ago
Powered, no doubt, by antimatter.
Jethro Flatline almost 6 years ago
Cute
KEA almost 6 years ago
In the movie ‘Soldier of Fortune’ (with Clark Gable) a little girl posits the theory that one could gather up a big bag of dark night air and then let it out in the daytime when a nap is necessary.
Nicole ♫ ⊱✿ ◕‿◕✿⊰♫ Premium Member almost 6 years ago
5 years ago on Reddit someone actually asked about a flashdark: https://www.reddit.com/r/askscience/comments/1ovt1a/flashdark_negative_flashlight/
BlueFin Premium Member almost 6 years ago
He’s been hiding well his flashdark till 2nd panel
kartis almost 6 years ago
Dark humour.
blackshire almost 6 years ago
A type of flashdark is actually (seriously) possible, and anyone can make one, using common household materials:
Tear a piece of aluminum foil off its roll, then poke a small hole through it, using a pin (just as you would to make a pinhole camera—such pinhole devices are also used to project an image of the Sun onto a white screen or piece of paper, for observing sunspots or solar eclipses), and:
If you hold the aluminum foil containing the pinhole facing a bright indoor or outdoor background (even toward the Sun itself, but don’t point it directly at the Sun!) and look through the hole, you should see a tiny black disc in its center—this is where light rays of opposing phase are cancelling each other out, creating darkness. In “The Second Book of Experiments” by Leonard de Vries, there is an acoustic home experiment which demonstrates how two sound sources—if the sound waves they produce are properly “in-step” (or out of step)—will cancel each other out, producing silence. He also mentioned that two similarly-arranged light sources produce such mutual wave-cancellation, and thus darkness.
Phil (full phname Philip Philop) almost 6 years ago
I want Juan.