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Build Your Own Crystal Radio
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
A good basic kit with everything you need to build a very simple crystal radio. This is not hi-tech hi-fi. Geared for ages eight and up, it is a complete kit with wonderfully straight forward instructions which walk the experimenter through hooking up tuning needle, crystal diode, and earphone, and experimenting to find useful antennas. Excellent education, recreation and discovery device all at the same time. A simple kit with hours of fun in it.
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88028 CRYSTAL RADIO KIT |
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50,000 Volts
That's what you get with this tesla coil!! Brand new, commercial item, great for classroom demonstrations and experiments. The 50,000 volt capacity generator radiates high frequency energy through space... enough to light fluorescent tubes two feet away. It uses 115 VAC (60 Hz) with an electro-magnetically operated interrupter buzzer, high voltage capacitors, inductive coil transformer, and a monopolar high frequency transformer generator to do the trick. 11" high, with a 6" sq. x 2" high protective housing for the generator. Includes accessories and instruction booklet with 19 experiments. Pretty amazing. But please, this is not a toy and should be used only under adult supervision.
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70301 50,000 VOLT TESLA COIL Note: This item is not eligible for Expedited Shipping or delivery to Alaska, Hawaii, or the Territories. |
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EMF Tester
Here's a cost-effective tester that lets you determine the electromagnetic field around power lines, appliances, computer and communication equipment and industrial devices. The hand-held instrument measures EMF radiation from 30 to 300 Hz. Single axis. The range is 0.1-199.9 mG and 0.01-19.99 uT, with an accuracy of +/- 4%. The 5" x 2-3/4" x 1" plastic case has a 1-3/4" x 3/4" LCD display and a switch to toggle between micro Tesla and milli Gauss. It's quick, easy and reliable, and when you see the EMF around your old monitor, it will give you one more reason to buy the new one you want!
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92254 EMF TESTER |
Disposable Face Masks
Extra-good quality disposable masks: Latex- and fiberglass-free, with a PVC nosepiece, 95% bacteriological and particulate filtration efficiency, and fluid resistance. Measure 7" x 3-3/4" with elastic ear straps and 4-fold, cone-shape construction. Packaged individually. We'll pick a box of white or pale blue.
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93490 FACE MASK |
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The Sparks Will Fly…
…when you crank up this 13-1/4" tall, hand-cranked Wimshurst generator. They were the toast of the 19th Century, and remained the hottest thing around, electrostatically speaking, until Bobby Van de Graaf came along. This one works like a top, zapping sparks to a fare-thee-well with very little cranking. It's mighty pretty too, in acrylic, white and silver, and will dress up a dull physics or electronics lab.
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93600 STATIC ELECTRICITY WIMSHURST GENERATOR |
Nifty Combo Headlamp
Nifty because it's got (8) LEDs and (3) modes: (5) white LEDs all-on for use as a, well, headlamp, (3) red LEDs flashing so the cave-rescue team can find you, and (3) red LEDs steady-on for that behind-enemy-lines work. The whole thing is attached to an adjustable, 3-strap elastic headband which also holds the battery compartment at the back with its own red LED bar as a taillight. Weather resistant. Runs approx (12) hours on the (3) alkaline "AA" batteries that you add.
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93708 HEADLAMP |
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Belgian Box
Olive-green plastic box with stainless steel latch and hinges, once the home of a Belgian army gas-detector kit (Gasdetectiedoos, Compleet) now comes with only its minimal dividers (one long, one clip), and possibly a leftover component or two. The sturdy plastic case is 10-3/4" x 6-3/4" x 2-3/4" deep, with a snap-down clasp and (2) 39" long canvas shoulder straps that are adjustable. Nice for a small toolbox or tackle box.
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39867 BELGIAN ARMY NBC BOX |
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Lightning Bolts!
The next best thing to lightning bolts! 200,000 volts of electrostatic energy created by our Van de Graaff generator. Measures 6-1/2” diameter by 15” tall, and a newspaper-like set of instructions includes lots of fun experiments. For grade 6 and up. This is not a toy and should be used under adult supervision. A great tool for teaching about electricity. For your convenience, we now have Lightning Belts: replacement belts to drive that overworked generator.
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94250 ASSEMBLED VAN DE GRAAFF GENERATOR | |
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94057 VAN DE GRAAFF BELT |
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