wbeaty

13 ms·

61.
by wbeaty 10y ago
But a water tower only has one terminal. A better "capacitor" would be a pair of water towers side by side. To "charge" this double-water-tower capacitor, pump some water from one to the other. And, when the water-towe
62.
by wbeaty 10y ago
That's what I started out with! Fill the entire universe with solid rock (since air and vacuum are insulating.) Bore out a cylinder, fill it with water (electricity), and add a piston and spring. Wires are water-channels added t
63.
by wbeaty 10y ago
Sure it does. You just have to look at the list of articles, not the giant pile of random notes. BEN FRANKLIN SHOULD HAVE SAID ELECTRONS ARE POSITIVE? Wrong. http://amasci.com/miscon/eleca.html#frkel EE would be mu
64.
by wbeaty 10y ago
Hydrogen gas is insulating matter. Ionized hydrogen is conductive matter. Too bad we don't have metallic hydrogen. It would be a solid conductor, just like any other metal. "Conductor" actually means "contains mobile
65.
by wbeaty 10y ago
When I step into the pond, the ENTIRE WATER LEVEL RISES AT THE SAME TIME! Water must travel instantly? So, a hydro dam is actually a method for sucking the energy out of the entire surface of a lake, all at the same time! (Actually the pr
66.
by wbeaty 10y ago
For those who don't like raw notes, why not read the finished articles instead? The index to the large collection is here: http://amasci.com/ele-edu.html
67.
by wbeaty 10y ago
So, you're saying that capacitors store electrons?! Debunking this particular conception was the whole point of my capacitor article http://amasci.com/emotor/cap1.html Capacitors "store" electrons, like
68.
by wbeaty 10y ago
Back in the old "Circuit Cellar" magazine era, they made a printer-hologram by photographing it onto film transparency. I recall that it was a "binary hologram" 300dpi covering a full 11" page, then reduced to a few
69.
by wbeaty 10y ago
> I never quite grokked rainbow holograms, If you made a scratch hologram, but your compass-point had a small cluster of fifty tiny needles instead of a single big needle, that comes close to the fringe-structure of Benton white-light h
70.
by wbeaty 10y ago
Key concept: what do the zoneplates of Benton holograms look like, as opposed to those conventional (off axis) holograms? A Benton white light hologram is composed of narrow horizontal slices of zoneplates, one for each reconstructed point.
71.
by wbeaty 10y ago
...and that's how we prove that white-light holograms aren't holograms. (Credit-card holograms function just like scratch-holograms, and their 3D image is not created via diffraction.) [Are these REALLY holograms?]( http:/&#
72.
by wbeaty 10y ago
Latest trick: LP albums, rotating scratch-hologram animations: https://www.youtube.com/watch?v=DLuvkcV2oi4&t=0m26s https://www.youtube.com/watch?v=jqNF9IWmFQE&list=PL60100E8F3... https://
73.
by wbeaty 10y ago
Scratch holograms may have led to the invention of stereo photography. Someone recently found that Charles Wheatstone wrote about this phenomenon first, after noticing it in lathe-turned flat surfaces. Wheatstone looked at it a bit, then t
74.
by wbeaty 10y ago
Put one on ROV for a trip to Loch Ness! That, or scavanging old outboard motors in muddy lakes. Don't miss multi-pages video gallery: http://www.soundmetrics.com/Image-Gallery
75.
by wbeaty 10y ago
Nope, theirs is the sound-camera, detector array and sound-lens, but with an acoustic floodlight. I think they do use ranging though, so the 2D image is "sound camera" in one raster dimension, and "sonar range" in the
76.
by wbeaty 10y ago
Search: acoustic camera. They sell phase-array microphones for mapping noise sources. Rather than a plane array, theirs is a sphere.
77.
by wbeaty 10y ago
Very very cool! And it's about time someone did it! Yours is the first hobbyist project I've encountered since my own extremely crude ten-dollar version in 1981. No square array or processing, mine was a mechanical scanner-disk:
78.
by wbeaty 11y ago
Too late! HP just announced a 3D semi-holographic display based on just this same optics. With theirs, each tiny reflective groove has several conventional LCD pixels in front, plus bright RGB edge-lighting. http://www.techno
79.
by wbeaty 11y ago
See 3.4 in the paper, http://amasci.com/amateur/hand1.html#34 also figure 11b. Yes, a proper "abrasion hologram" would have holo-pixels resembling little fresnel-lens cross-sections. The "hand drawn&qu
80.
by wbeaty 11y ago
An electric circuit is a circular channel full of water, a loop-river. An off-switch is a wall of dirt placed across the channel. A battery is a dam with a pump, where the pump runs just enough to maintain a 1-ft level-difference across the
81.
by wbeaty 11y ago
Mcoils article was much longer, but I never made the GIF diagrams for the second half. Do this: make a small half-inch parallel-plate capacitor with a 10ft thick dielectric. Use the insulating dielectric as an "AC conductor."
82.
by wbeaty 11y ago
As Win Hill says, his "transistor man" is later discarded, and replaced by voltage-based design which eliminates hfe, relying on Vbe and Ebers-Moll equation. This makes his book even more excellent. And the lab book for AOA goes
83.
by wbeaty 11y ago
You're reading my raw notes from pre-internet days. Please stop! :) Try my main article index, http://amasci.com/ele-edu.html > Fair enough for him to make that choice No, it's just that someone has found a dee
84.
by wbeaty 11y ago
Heh. The very first line says that THIS IS 1989 RAW UNEDITED NOTES. http://amasci.com/ele-edu.html is the large collection of finished articles.
85.
by wbeaty 11y ago
Whoa, amasci.com traffic spike! Heh, wasn't there a Larry Niven SF story where an alien weapon would zero out the charge of electrons, so the nuclei would fly apart? Our undergrad phys-101 had calculating the force between two (copper
86.
by wbeaty 11y ago
> How can you be sure the cars behind you aren't even more compressed Because, uh, you don't drive slow. You drive at the average speed of traffic. Not slow. To smooth out the traffic waves, you don't come to a halt, a
87.
by wbeaty 11y ago
ACC just imposes safe driving behavior: proper spacing for the reaction time. So if just 20% of humans were safe drivers (spaced out properly,) then everything smooths out. That, or perhaps 0.5% of drivers could intentionally go at the ave
88.
by wbeaty 11y ago
The papers I've seen on this conclude that rear-end accidents are the major issue. Smoothing the waves can eliminate immense rush-hour delays, if this eliminates panic-braking that can cause minor daily accidents. Or as they say, &q
89.
by wbeaty 12y ago
Same principle as Benton white-light holograms, see 2003 SPIE paper linked on the site, also "Not true holograms?" The scratches are line-scatterers, not flat-bottomed as Fresnel, so no focal length. Basically it's an enlar
90.
by wbeaty 12y ago
Like mine here? https://www.youtube.com/watch?v=XUy8lELWhJg&t=50s When people at work angrily insisted that these were not true holograms because you can't make opaque objects, I sat down and drew opaque objects.

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