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Underwater Kite
Very cool absolutely useless kite-like thing consisting of a central 19" dia disc and (2) 9 ft. "tails" one emerging from each side of the central disc. The disc is actually a metal hoop. It is covered with a very light, strong non-woven fibrous material that is translucent and extremely porous, allowing water to pass right through it. The tails are made of this same material. We have been told it is some kind of drogue for a chute used with a depth charge. We are also told it was used under water. We surmise it is an underwater drogue used to deploy a detector antenna. But it may just be a toy for Merkids. We think you will find it amusing, and may wish to chop it up and use the cool fabric in your own construction. White or olive drab, our choice.
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30153 DROGUE |
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" |
Microscope Gee Whiz
Wonderful little book jammed with elaborate colored drawings that tells the beginner a little about everything to do with a microscope. And all in a mere 48 pages! From data on the history and types of microscopes, to introductions and samples and how to prepare them, (from tissues and insects to crystals) to ideas for experiments and lists of simple equipment needs, and how to build them at home, this book is a veritable cornucopia of information. If you are thinking of getting a microscope, we strongly recommend "The World of the Microscope" as a great stimulus for the novice user. It won't answer heavy duty scientific questions. But it will keep the beginner busy, challenged and entertained for days and weeks! By Chris Oxlade and Corrine Stockley. Paperback, 7-3/4" x 9-3/4". One of the Usborne science and experiments series of books.
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88741 THE WORLD ... MICROSCOPE BOOK |
Long-Life Lamp
This multi-position LED lamp stands 10" tall and functions as a desk lamp, hand-held flashlight, or hanging light, and runs for 20-plus hours on a single set of (3) alkaline D-cell batteries. (Will also take a 4.5VDC female center plug adapter if you've got one.) Has (20) LEDs in a 4" x 2-3/4" oval reflective face that ratchets up and down. Includes a switch to choose all or just (10) of the LEDs. Silver and black plastic, its life span makes it a perfect emergency light.
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93249 20-LED LAMP |
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