How do I build a parallel light source,  5''dia.?
442077
You need a parabolic 5-inch reflector which you can get from headlight (but not a sealed beam) or a large flashlight. Or you can use a 5-inch convex lens like the ones used for close-up work (try a hobby shop). You will also need a very small source of light. A flashlight bulb should do. The light source should be positioned at the focal point of the reflector or lens. Since the lens/reflector will not be perfect and the light source will not be a true point, the beam will not be perfectly parallel.\nThe sun IS a near-perfect parallel light source in the context of a 5-inch viewing field. Maybe that's what you meant. I can't see it being used by your construction.
55892
try mininova.org\n\nhttp://www.mininova.org/cat/8
743232
I'd suggest a minimum 5kW generator.  I can't imagine the sewing machines being more than a few hundred watts operating power, and it is unlikely all five will start up at once for surge currents to add.  There should be plenty of headroom left over for the fans and lights.\n\nVisit my home generator page for other ideas.\nhttp://members.rennlist.org/warren/generator.html
951468
There are a number of products on the market that will do what you want, and be certified and safe.\n\nMake sure you get a warm LED though: cool white LEDs produce a terrible colour of light.\n\nhttp://www.theledlight.com/120-VAC-LEDbulbs.html
961419
On paper, it is simple, u will use a y-axis for elev,, x-axis for distances --- like a Profile layout.\nBut i reckon u want a display 'model', well same logic, and u can use diff color.. only use very fine plumb lines or plastic threads as interconnections. Better encase the result in a glass/Plexiglas cabinet.
1038476
Easiest way is to put the light source as far as possible yet reachable, so plant tends to elongate itself in order to get the ligth
362160
Go to microchip.com for chip specifications. Have 6 outputs to LEDs. green/yellow/red for each direction. Make timing loops in basic. MIKE
545902
Really easy project: http://www.hilaroad.com/camp/projects/clinometer/clinometer.html\n\nEasy trebuchet: http://hila.webcentre.ca/projects/trebuchet/index.htm\n\nEasy dome: http://www.hilaroad.com/camp/projects/dome/dome.html\n\nMeasure the diameter of the sun with geometry: http://www.hilaroad.com/camp/projects/pinhole_sun/sun_diameter.html\n\n\n\nA suspension bridge would be a nice project because the shape of the main cables that holds up the bridge is a mathematical curve called a "catenary."\n\nhttp://www.infovisual.info/05/028_en.html\nhttp://en.wikipedia.org/wiki/Suspension_bridges\nhttp://en.wikipedia.org/wiki/Catenary  (This article explains that the St. Louis Arch is an inverted catenary, and it even gives it's dimensions and the formula of the curve.  You could make a scale model.)\n\nAnd, it looks like I'm wrong  about suspension bridges.  Their main cables are parabolas, because of the weight of the deck.\n\nHere are some more projects you can check out:\n\nhttp://www.astrocappella.com/activities/cosr_lp.html (make the umbrella rigid by painting plaster on it)\n\nSolar reflectors would be good projects using parabolas: \nhttp://www.hilaroad.com/camp/projects/solar_energy/Hila_Solar_Energy.html\nhttp://www.cockeyed.com/incredible/parabola/parabola.html\nhttp://www.humboldt.edu/~ccat/solarcooking/parabolic/parabolic_solar_cooker_pg_3_html.htm\nhttp://peacecorps.mtu.edu/solarcookers.htm\nhttp://jc-solarhomes.com/fair/parabola20.htm
271735
They make those. Maybe try http://www.skyandtelescope.com \nOr you could take a regular globe mark some 300odd major stars in position with the aid of a star catalog (glowinthedarkpaint?) and then paint the rest black. Everything'd be backwards unless you could stick your head inside (?) Meow.
145039
The best project will be one that has some interest to the 5th grader. So my granddaughter likes animals. But my youngest boy likes photography. So a pinhole camera would bore my granddaughter but would have caught the interest of my son.\n\nThat being said... Here's an easy one. Go to a store and find some cheap analog clocks (clocks with hands) that run on a single AA battery. Then go to Radio Shack and get some battery holders and some "aligator clip leads" -- short wires with clips on either side. And get a bunch of different brand batteries of different sizes (if you are trying to get by simply, use only AA batteries and then you just need the clocks and the batteries).\n\nTake off the battery covers and hook up the battery holders to the clocks with the clipleads (unless you are only using AA batteries). Then put batteries in and see how long it takes for the clocks to run down. This may take a long time. If you are short on time, try this. Get a flashlight bulb at radio shack and put it across the battery with the clock. So this way the battery is running the clock and the flashlight bulb at the same time. Note the time on the the clock and check it every day to see when the clock stops. You can graph the results easily.\n\nQuestions:\nWhat lasts longer, a AA, a C, or a D battery?\nWhat brand of battery lasts longer?\nWhat lasts longer, a standard carbon-zinc battery or an alkaline battery? What is the cost difference per unit? Per run time?\n\nA little research on the internet about how batteries are built, and the different technologies (carbon-zinc, alkaline, nicad, NiMh, lithium, lead-acid) and you have a great project.
1056339
There are a few items you will need:-\n1) A source of high voltage (to exicte the gas in your laser to emit photons). A readily availible item to do this would be the ballast (transformer) in a flourescent tube. This should get you up to between 700 to 1700 volts. It is preferabe if you have a supply closer to the upper end. This is dangerous so be sure to use appropriate precautions when working with high voltages.\n2) Choose the type of gas to excite. Gases to use include Carbon dioxide, helium, argon, neon, krypton - depending on the frequency you want from the laser. A nice big ruby could be used to make a really cool ruby laser - I could never afford to buy one though.\n3) build a laser tube - or better buy one from ebay. If you have glass blowing skills and make can make your own electrodes and embed them in the glass tube and make partial reflective mirrors on the end or the tube you can make one - but it's really tricky.\n4) fill your lser tube with the gas/gases you choose under reduced pressure.\n5) connect the electrodes to your power supply\n6) power it up....\nIt's as easy as that... uses the same basic principle to a flourescent tube, except that all the light from the partial reflector window is in phase.\n\nFor more detail I suggest you google something like "home made laser"
450084
Don't worry about brands of lights. Light is light, and it doesn't matter who made the instrument. What you really need to worry about is how many lights you can get, what you're pointing them at, and who's going to be in charge of setting them up? Since you're working with little/no budget you have to make the most of your resources. Have you considered using *no* lights? If you've never heard of Dogma films, then take a while to read about them.\n\nhttp://www.google.com/search?q=dogma+95&start=0&ie=utf-8\n\nThe Dogma films prove that quality movies can be made with no outside lighting at all, and it's definitely worth a look.\n\nIf you're determined to use outside lights, then you're going to have to get them from somewhere. Borrowing or renting is the way to go, as buying them will be prohibitively expensive. If you go the rental route, be sure to mention that you're a student / indie filmmaker. Many rental houses will cut you a break now in hopes of keeping your business later.\n\nThe next key thing to worry about is who's in charge of the lights. A competent cinematographer can do more with four well-placed lights than an amateur with a truck full of equipment. Get someone with experience shooting on DV, and take full advantage of what they know. Make sure they can shoot *your* kind of movie, as well. Someone who's shot twenty horror films and nothing else might be completely useless if you're making a romantic comedy.\n\nThere are a million books on cinema lighting, and I can't really say that there's one best one out there. If you don't have much of a background in lighting then the most basic place you should start is reading up on three-point lighting.\n\nGoogle for "three-point lighting"\n\nhttp://www.google.com/search?q=three+point+lighting&start=0&ie=utf-8\n\nA clear explanation of 3-point for computer-generated scenes. (It's still the same theory)\n\nhttp://www.andrew-whitehurst.net/3point.html\n\nLast but not least, read a little about color temperature, color correcting gels, diffusion, and the tools you need to cut & shape lights (flags, silks, nets, cookies). Those fine touches are what separate amateur lighting (which looks doubly worse on video) from professional level work.
520858
Try this link! http://www.neon.com/ls1.shtml
1107249
Suggests the ideal lamp position for installation purposes.
704003
Try a party store. Look for table skirt clips. They should be able to attach to the awning and then you clip the lights on.............
134155
Put a TV, and computer monitor on the ceiling.\njust kidding, roll over to the nearest light source and turn it off and on at a constant rate.  hopefully someone will see it through a window.
664846
extra lighting, make it super bright