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Oxidation and the RA Prism
RA means right angle, which in prismese means two 45° and one 90° angle. Oxidation is how glass rusts, and it looks like a powdery white stain that won't rub off. Really doesn't interfere with the optical use of the prism, but it can be annoying. You have two choices. Ignore it and reap the price advantage, or get some of the polishing compound you use on auto windshields, buff off the surface, and reap the price advantage. These seconds have chips and/or surface scratches. Use them as spectroscopic prisms, put two hypotenuse to hypotenuse as beam splitters. All have 1-1/2" legs and 2" hypotenuses. The thickness varies as noted (sizes are approximate), and the silvered ones (sil) have a reflective coating on the hypotenal face while the plain ones (pl) don't. Remember that the silvered ones, which may make better periscopes, don't work for spectral experiments or as beam splitters.
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3530 RA PRISM, 1-1/8" PLAIN | |
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3525 RA PRISM, 1-1/8" SILVERED | |
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4311 RA PRISM, 2-7/8" PLAIN |
Me, Me, Me, Me, Mee
You can start with our single aluminum tuning fork, 2-tined and 7-1/2" long. It vibrates at 256 hz, and is labeled "C". Or you can order the set that has (8) forks and a mallet with a rubber-tipped plastic head. The forks are labeled low-C to high-C and come in a fitted, latched wooden box. Unfortunately, C.J., who has perfect pitch, tells us that his pitch is more perfect than most of the tuning forks. He also says you can file the tips, tuning them to an electronic keyboard until they're perfect - and we think there's a certain cachet to telling people you tuned the forks yourself. But they are perfect, if you're using them for things like teaching principles of sound or driving the chihuahua crazy.
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91185 TUNING FORK | |
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91772 TUNING FORKS, SET |
Break Your Own Geodes
Pop one of these roughly 1-1/4" dia stones into the toe of a sock, smash it with a hammer, and be the first person ever to see your real-as-Nature-makes-it geode!! Ninety percent of them have the familiar beautiful white crystals inside. Formed by volcanic action, they are found all over the world, but ours are from Mexico. There is no way to tell from the outside if they have crystal centers, but we will send you two just to raise your odds, and we haven't had a dud yet in our stores!! Much much more fun and satisfaction than buying one already cracked.
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88823 GEODES |
Really, Really Old Animals
That's not just a rock -- that's a fossil nestled in the hinged clear-plastic display box 3-5/8" x 2-5/8" x 7/8". We have several different plants and animals, in different sizes and colors, including crinoids, brachiopods, turritella, dinosaur, and more, each with its own information sheet. We'll choose (2) different kinds for you. Now, can we interest you in a dissection microscope, so you can really see all those fossilized details?
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34247 BOXED FOSSILS |
Agate Slab
Polished slice through a piece of agate. It will show concentric rings reminiscent of a tree trunk in colors ranging from milky white to blue to yellow to brown. Each sample is unique! Roughly 1/8" thick x up to 3" dia. Lovely.
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88584 AGATE SLAB |
Original Slinky(r)
Does anyone need to be told what a Slinky(tm) toy is?? Okay, it is a very slack spring, 2-7/8" dia x 2-1/2" long, compressed. It will stretch out to about 5 or 6 feet long without deforming. That's the boring part. The interesting part is that it "follows" itself. Slosh it from hand to hand. Put in on the top step of stairs, flip the end down a step, and watch it walk down stairs, or down an incline. Believe us, no childhood (or adulthood) is complete without an original stainless steel Slinky(tm). It was hard for us to find it, but we are glad we did. You should be too.
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88701P1 ORIGINAL SLINKY | |
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88701P3 ORIGINAL SLINKY 3 PACK SAVINGS! |
Whet Stones
Keep small knives and tools sharp. The sharpening stones in our 2–pc set include (1) large 6” x 13/16” x 3/8” and (1) slim 4” x 3/8” x 1/10”, both labeled 320 grit. The stones in our 3–pc set are all 4” long x 1/4” square. We know they have (3) different surfaces, but we haven’t a clue to their true grit.
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31793 WHET STONES, 2 |
It's a Little Gem!
Actually, it's a set of (36) different little polished gemstones and minerals from around the world, all identical sizes (1/2" x 3/8" x 1/8" thick), mounted and identified by name and origin on an 8" x 10" card. Super nice at a super price, for teachers, designers or jewelry makers. The set includes amazonite, amethyst, aventurine, black obsidian, blue lace agate, buttermilk jasper, carnelian, Dalmatian dacite, dumortierite, fancy jasper, fluorite, gold stone, hematite, howlite, jadeite, lapis, leopard skin jasper, mahogany,obsidian, moss agate, nephrite, Picasso jasper, orange calcite, picture jasper, rainbow jasper, rose quartz, rhodonite, rock crystal, rhyolite, red jasper, snowflake obsidian, sodalite, serpentine, tiger eye stone, turquoise and unakite.
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92883 SAMPLE GEMSTONE |
Pluto Lives!
Hanging from your ceiling. Our multi-color glow-in-the-dark solar system DIY 3-dimensional mobile includes a 4-1/8" dia sun, 2-3/4" Jupiter, 2" Saturn with removable rings, 15/16" Uranus and Neptune, 13/16" Earth and Venus, and 11/16" Mars, Mercury and Pluto, all with little rings at the top to hang them from. Includes (32) feet of cord and a fact sheet. If, on the other hand, you want to be on the astronomical cutting edge, just leave Pluto in the box and tell him to get over it.
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93013 GITD SOLAR SYSTEM |
Stellar Magic
Hang up these Morph Cosmos" characters, or stick 'em on the ceiling: The 5" to 6" dia full-color illustrations of (6) constellations incarnate (Ursa Major, Orion, Perseus, Cepheus, Andromeda and Cassiopeia) will morph into the glow-in-the-dark stars that gave rise to them when you turn out the lights. An interesting one-minute astronomy lesson appears on the back of each package. We'll pick (3) of them for you.
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37953 MORPH COSMOS |
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