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LEDs By The Dozen
Light emitting diodes. Solid state devices that provide the ubiquitous power and indicator lights on your electronic gadgetry. Unlike lamps, there are no filaments that glow. Rather, some two volts of DC power at a miniscule 10 to 20 milliamps of current get the chemistry excited, and they just plain emit. Emit is a good word, too, as they don't really cast light, but glow brightly. We have a nice assortment of 3 and 5 MM diameter sizes in red, green, orange, and yellow. The longer lead is always positive, the shorter always negative, and you always need a current limiting resistor (about 500 to 1,000 ohms for 5 to 9 volt DC sources) to keep the current in the 10-20 MA range. If that's Greek to you you're either going to blow a lot of LED's or learn to change incandescent indicator lamps ! !
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6796 LED ASSORTMENT |
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A Pyramid of Prisms
Polished glass equilateral prisms. Equilateral because each edge of the end is the same length, 32mm. Thus, as all you geometry students know, each of the angles is also the same, 60 degrees. These are school grade and are fine for decorative and demonstration. They do a nice job of diffracting light to produce a nice rainbow-like spectrum, but are definitely not up to instrumentation standards. The missing dimension, length, is shown below.
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31801 PRISM, 2" | |
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31798 PRISM, 4" | |
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31799 PRISM, 6" |
Full Page Magnifying Sheet
Flat plastic Fresnel lens. This flexible magnifier is 7-1/4" x 10-1/4" and only about a millimeter thick. It is great when you need to scan a list or to look for something in a directory. You can see most of the page without moving the magnifier. Only about 1.5 power, but that can make a huge visual difference. The quality is not high, but neither is the price.
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8665 MAGNIFYING SHEET |
Wow! Double Wow!
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
This is Philip’s new favorite toy, since he blasted a rocket so high over our parking lot that he lost sight of it (the rocket, not the parking lot). The Air Burst™ Rocket system has a 26” tall, air–powered tri–pod launcher made of plastic and rigid foam. A 65” long air hose connects it to any stand–up bike pump. After a few pumps, the air pressure bursts a replaceable booster disc in the launcher and sends a 10” x 3/4” dia rocket 250 to 1000 feet into the air. Wow! The system includes the launcher, (2) rockets, and (60) boosters (two different weights). Sending rockets out of sight, even if they usually come straight back down, is an ingenuous ploy for selling extra rockets. Our each is a pack of (2). And having extra rockets is an ingenuous ploy for selling extra booster discs. Our each is another bag of (60). Warning: The Air Burst™ Rocket is for ages 10 and up, with adult supervision. Don’t let us catch you out there without a kid!
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92025 AIR BURST ROCKET SYSTEM | |
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92027 EXTRA BOOSTER DISCS | |
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92026 EXTRA ROCKETS |
Closeup
Designed for watchmakers, this aluminum loupe with a 1" dia, 10x glass lens snugs to your eye, but leaves your hands free, thanks to the flexible 15" headband that encircles your head. It has a 1-1/2" working distance, and would come in handy, too, if you poke around in needlepoint or manipulate anything miniature.
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91792 HEAD BAND LOUPE |
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Seltzer Power!
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
Incendiary rocket fuel? We don't need no stinkin' incendiary rocket fuel. We got the Mighty Seltzer Rocket! The seltzer rocket, made of simple plastic parts. (No, don't lean over it!. That's not a foam nose cone, you know!) The 4-1/4" x 1-1/4" dia seltzer rocket that holds water and (1) dissolving seltzer tablet. The rocket that has shot almost 30 feet in the air for us. It comes with (4) antacid tablets, just like those you can buy at the drug store -- and it's basic science at its best!
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92303 SELTZER ROCKET |
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Insect Inspection
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
When you peer through your magnifying glass at this specimen, or focus your microscope on it, even at the lower magnifications which work best, you're looking at one big bug. Make that (4) big bugs. The insects are real, encased in clear acrylic blocks 1-3/4" x 1-1/4" x up to 11/16" thick, and ready for inspection. Set 1 includes a scorpion, giant ant, wasp and a flower bug. Set 2 is a cricket, locust, yellow leaf beetle, and crab. No, not a crab louse or a crab spider, but definitely a crab ugly….
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92415 INSECTS SET 2 | |
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92224 INSECTS, SET 1 |
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Go Ballistic
Nothing to it with William Gurstelle's "Backyard Ballistics," a soft-cover, 169pp compendium by an engineer on constructing rockets, cannons (carbide and spud), flingers, tennis ball mortars, balloons, fire kites, and other intriguing devices, all with common household materials. The detailed text includes parts lists, illustrated instructions, photos and quite sensible and necessary safety precautions. From Chicago Review Press.
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92823 BACKYARD BALLISTICS |
Wanna Toggle?
The correct answer is "I don't know; I've never toggled." If, however, you just want to turn something on and off, here's a choice of toggles for your switching delectation. The DPDT toggle is rated for up to 20A at 125VAC and has screw terminals below. Measures 1-1/4" x 1-3/4". No center-off position. The first DPST toggle is rated for 20A at 125VAC or 15A at 250VAC. Screw terminals on the bottom. Measures 1-5/16" x 3/4". The smaller DPST toggle is rated for up to 4A at 125VAC or 2A at 250VAC. Has 3/16" spade terminals on the bottom and measures 1" X 9/16". All the toggles come with switch-plates and mounting nuts.
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38715 DPDT TOGGLE 20A (A) | |
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38716 DPST TOGGLE 20A (B) | |
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38717 DPST TOGGLE 4A (C) |
Blowing Smoke
For fun or science. And it's not actually smoke, but a fog created the same way they do for movies and heavy metal concerts. The Zero Blaster is a ray-gun-shaped, black-light-sensitive pistol that pumps out 2" to 4" dia smoke rings (rotating toroidal vortices, to be exact) that will, one after another, waft up to 12 feet away for hours of good, clean fun. Measures 9" long x 6-1/2" high. The Wizard Stick is a fog-producing wand, 10" long on a 4-5/8" x 2-1/4" base, and comes with an instruction manual for science experiments and special effects, including making wind tunnels and a vapor-ring blaster. Also good as a household draft-finder. Each takes (6) "AA" batteries, not included, and comes with a 3-ounce bottle of non-toxic fog juice, good for 25,000 smoke rings or a whole lot of fog. Better order an extra bottle of Super Zero Fluid, the replacement juice, just in case.
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93586 SUPER ZERO FLUID | |
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93585 WIZARD STICK |
$20.95
EACH
Out of Stock. Check Back Soon! |
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93584 ZERO BLASTER |
$22.95
EACH
Out of Stock. Check Back Soon! |
Page-Sized Fresnel Lens
Magnify the whole page and see all that nasty fine print at one time. Our hard acrylic fresnel sheet is 8-3/8" x 11" x 1/16" thick with a focal length of approx 10". Magnifies to about 2X. Solar experiments, too!
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38939 FRESNEL SHEET |
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