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Mastertime
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
It's about time that hour children learned the minute details of reading a clockface. We're not sure if we can second Mastertime's megalomaniacal claim it's "the biggest breakthrough in the learning of time," but it is a smart way for 4- to 9-year olds to pass the time. Includes a brightly colored, almost-8" plastic clock face, (2) dodecahedral dice, tips for parents, and instructions for (3) different games.
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35687 MASTERTIME |
The Mother Of All Fresnel Lenses
It came from either outer space, or a projection TV. Our largest Fresnel lens measures 49-1/8" x 37-1/8" x 1/16" or 1/8" thick, with a 42" focal length. Build your own lighthouse or projection TV, teach optical properties to students, or just turn your 21-inch model into one with a tavern-size picture. Held in the sun, the lens will concentrate rays enough to cook eggs or torch lumber. And, under adult supervision in the parking lot, employees of a certain un-named scientific and surplus purveyor actually melted pennies in seconds. Extremely cool and done strictly, we assure you, to determine the lens's focal length. Do not, we shouldn't have to remind you, store this puppy in direct sunlight. Or let the underage or under-mature sneak it into the sunlight.
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37930 HUGE FRESNEL LENS Note: This item is not eligible for Expedited Shipping or delivery to Alaska, Hawaii, or the Territories. |
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