Externet

I meant that for the tail action, veeeery gently compressing (and expanding) the atmosphere air cyclically to propel forward. The helium too. Barely compressed.

Think out of the box... No tanks , very lightly and gently compressed air : Isn't that beautiful ? Now make yours like a bird...

Am not sure if white light behaves the same on lenses as monochromatic red led. To avoid the curvature of the earth as impediment, imagine a modulated beam of white light hitting a cubic reflector on a geostationary satellite -no clouds:rolleyes:- With a telescope, you could 'receive' the reflection, couldn't you ?

Hi all. How can light from multiple sources be simultaneously directed to a single area/direction ? Is there any unusual -or not- shape of lens/material/coating (cone, dome... ?) that refracts light incoming from any direction and bends/focuses it towards the same spot ? Those "solatubes" installable on roofs gather light from nearly all directions and by its mirrored internal surfaces tube it is 'piped' to a single 'destination' If a chamber had its 4 walls and ceiling covered with light bulbs, what optics contraption could be placed in such chamber so the light hitting the contraption be channelized/ducted/refracted/conveyed to the surface where it stands ? Would a hemispheric lens (flat at bottom) illuminate the surface it rests on with the sum of light incoming from all directions ?

Hi. Perhaps I should sell it. But I will not send it via mail, UPS... Contact me at externet at inorbit dot com Miguel

Not the watch, but I have a kit from the fifties to paint watch hands. It is labeled "Radium" on the instruction pamplet. No clue on its concentration or to confirm what is it; assume it is the regular concentration watches had. It has about 1g. of a pale green powder in a glass vial, some glue to mix it with, sovent, a microdish... A 5 year old post: http://www.scienceforums.net/forum/showthread.php?t=10088&highlight=radium Edited: added----> This is a picture found on the web, like my kit: http://www.orau.org/ptp/collection/radioluminescent/favoritetouchupkit.htm (This has the radium vial missing) Rightmost here: http://www.orau.org/ptp/collection/radioluminescent/radioluminescent.htm

Is there any way to have a 30cm ⌀ source of intense enough white light beam to reach a couple of hundred miles with the least divergence possible, perhaps up to a mile ⌀ ; by 'cheap' methods/lensing/whatever ? A lighthouse fresnel lensing can neatly reach 20 miles; what would it take to make it 200 ? How do airport beacons work ?

A metal box and also a mesh can greatly reduce the passing of radiofrequency, as the window your microwave oven has. Wrapping a house would not be simple. And 'grounding' such may not be fully effective. Having it laid all even under the house may be better. Some people is more sensitive to become paranoic to the subject. Years ago I read research took place by placing very high AC voltage plates directly above and below a large amount of eggs in an incubator, full time during 3 weeks the process takes. No defects were found on the chicks. :eek: Yesterday I heard on Public Radio, that Alzheimer disease was reduced and eliminated in laboratory rats exposing them to 4 daily hours of cell phone radiation, and examination showed that some sort of harmful chemical 'dentrites' in the rats brain were dissolved by the 'treatment' Personally, have no opinion on EMF effects, other than microwaves do cook whatever is nearby. On a very recent post of some forum; a guy placed his cordless phone inside an off microwave oven, and called to it. It rang !!! Some debate about the shielding facts, led nowhere.

What is your DC supply voltage available, what is the ionizer output DC voltage desired, at what current and what polarity ( negative ions or positive ions ) ?

Hi. Landed birds seem to move their heads in jerks, as if their vision would not work well in uniform motion; and at the same time, they are supposed to have good vision moving in flight... Most walking birds keep the head motionless while the body/legs advance, until repositioning the head in advance and repeating. What is going on ?

What would it take to store all that lack of heat from tons of snow and cold days to be released later in the summer; and all that heat from the summer to be released in the cold of the winter ? Dreaming to eliminate the heating/air conditioning costs on dwellings. A basement or a large room filled with thermal masses ? With some 'magic' material with a huge heat absorption coheficient? Plain rocks ? Scrap metal ingots ? The subsoil, at around 40 feet deep, the temperature is a nearly stable all year to somewhere by 55 F. There is no chambers with thermal insulation walls in there; nature works fine. Injecting some fluid in there? Geothermics works. But not everyone has the backyards, the drilling$ ... Any alternatives to make a large thermo ? Dream of how all the snow from city sweepers can be kept until august :-)

Hi, Skeptic. Metal? Say the disc is not metal. The extra effort exerted by the motor is due to overcoming the attraction/repulsion from the magnets proximity. In other words, If a solenoid with a long rod had to pull a magnet away from another; compared to no magnets to act upon... Separating stuck magnets does need a force x distance ÷ time

An electric motor spins a disc with magnets attached. Takes say 10 Watts. Magnets are placed fixed near the disc. The motor exerts extra effort to overcome the magnets that try to brake the disc motion. Motor takes now say 20 Watts to run overcoming the magnetic braking effect. Do the magnets warm up? If it was a free running drill using 10 Watts, comparing to 20 Watts when actually drilling, are the extra 10 Watts shown as heat at the drilling friction action (bit, part drilled) ?

Yes, mercury can behave as a conductor crossing the lines of force of the spinning magnet, 'shortcircuiting' the current generated. Will that generate heat that will warm up the mercury; in the same amount of extra power needed to spin it compared to a non-magnet iron piece ?

Hope this does not confuse you more, but you should read it : http://www.eskimo.com/~billb/miscon/whatis.html

As the earth spins, lines of force facing the sun are 'compressed', and 'expanded' at the umbra. http://www.biocrawler.com/w/images/1/19/Magnetosphere_simple.jpg Does it mean they are constantly changing its position and shape as they pass from a compressed state at noon, to dusk, to midnight, to dawn ? Do they cyclically deform and also rotate ? Question number two... Electrical wiring in orbiting satellites are constantly crossing magnetic lines from the earth field. Does such generates 'stray' currents in their circuitry ?

Which one demands more force to spin if held submerged in mercury; a magnet or a plain iron piece ? -Being both equal shape, size, speed, depth...

A capacitor won't take current from a battery and convert it to household electricity. A capacitor may store some energy from a battery. Conversion of battery electricity to household electricity is done by a device/circuit named inverter. Like the devices used in some computer systems to provide electricity to power the computer during a household electricity outage. Also known as UPS Uninterruptible Power Supplies. They have the inverter circuitry plus an internal battery and provide household electricity for a limited amount of time depending on the battery capability. ===> http://www.backwoodshome.com/articles2/yago89.html Miguel

OK, understood. The very-dead-by-frying harmful microorganisms may not harm the digestive tract, but the toxins they left behind could. Thanks

Hi. If there is doubt on how fresh food is, say meat, fish... the best is to discard it and avoid any food poisoning. But, if some meat is in a state that by mistake is believed to be good; would having fried it kill all microorganisms that would produce a digestive illness ? I say frying instead of boiling, baking because I believe it would raise the temperature to the highest 'action'. What would happen ingesting very fried food that was not 'good' ?

Thanks. Yes, launching a large structure is not even to consider; it would be modular put together as the ISS is. I see no need to counter rotate a portion of it. The tethered way may not need a useless counterweight, just another module; which would be like two self functioning opposite sections of an unfinished 'ring' ((-----⊕-----)) The tether ----- being a laboratories duct instead, transitable between quarters )) Would this provide full range of desired gravity to microgravity selection zones depending on distance from the axis ? So there is not much part of that fiction that hides a physics flaw? Thanks.

The artificial gravity from the fiction book/movie 2001 created by spinning the whole spaceship; would that be somehow feasible ? What technical hurdles keep it in the fiction domain ?

That is a myth. The only law is "Wring the customer wallet as much as possible for as long as possible" In more polite terms, "What the market can bear"

I believe already has. But my 5.10 and later 7.04 behaved so well for several years, and when I attempted to make 9.10 work in my compfuser, too many hurdles showed up which I was unable to resolve with my poor skills. So went to 7.10 and also does what I need veeery well. The way I find convenient is to use a blank hard drive to try newest versions. If unable to make it work, I just swap back and nothing has happened. am sooo bad with handling compfusers that tried to upgrade Mozilla and got as far as having the 'install ?' file on my desktop and cannot go beyond that.