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Large Rock Polishing Kit

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Large Rock Polishing Kit
warning WARNING: CHOKING HAZARD-Small Parts. Not For children under 3yrs.

Budding lapidarians will lap up this rock polishing kit which is so complete it even contains some rocks. The polishing tumbler has a (3 lb. /1 qt.) fifteen sided rubber barrel and is driven by a 115 VAC motor. Overall dimensions are 6" x 6" x 7-1/2" high. In addition to the tumbler, the kit includes an assortment of jewelry findings, a #300 4-Step Grit Pack and a detailed manual giving you easy to follow instructions. But don't think of it only as useful for jewelry making. As a hobby, our Uncle George for many years collected and polished a wide variety of rocks which he found interesting and made beautiful in and of themselves. The #300 4-Step Grit Pack is also available separately, for when your grit has run low, and includes 4oz. coarse, 4oz fine, 2oz. prepolish and 2oz polish grits. 

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Articulated Robotic Arm Kit
It doesn't get much cooler in the robotic-arm-kit game. The assembled arm is 15" tall x 9" long x approx 3-1/2" wide. It's 2-pronged hand opens to 1-3/4", lifts up to 3.5 oz, swings 120 degrees at the wrist, pivots 300 degrees at the elbow, and sits on a base that swings 180 degrees up and down and rotates 270 degrees, like, well, an arm. Controlled by (5) 2-axis joy-sticks and powered by (4) D-Cell batteries that you provide. Includes a hand-mounted light and over-torque and gear-breakage alarms, which is more than your arm has. Requires simple hand tools for assembly and is made for ages 13 and up.
$52.95 EACH
Let There Be Light
Snap Circuits® (by Elenco®) does it again, this time with light, although the (182) projects also feature the interplay of light with sound. Projects include color organs, strobes, IR detection, LEDs, color spectrums, motor control, photo resistor and transistors. You can even plug your audio player into some projects. CJ, our Senior Light & Sound Boffin, called it "an enchanting rainbow of scientific theory wed to practice, with fun in the bargain," but he talks like that sometimes. For ages 8 and way up, it has over (55) parts and yes, they will play well with other Snap Circuit® components.
$59.95 EACH
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.
$79.95 EACH
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