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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 |
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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 |
IQ Block
Clever little mind teaser of the travel toy variety. A black plastic case, 3-1/4" x 3-5/8" x 3/8" holds (10) different brightly colored plastic blocks or shapes. Pick one of the shapes and place it in a corner of the holder. Then try to get the others to fit in. You can start with any of the shapes and there are over (60) solutions, so the little dears won't get too frustrated. Fun for the geometrically minded. Ages 6 and up.
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89347 I Q BLOCK |
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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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88701 ORIGINAL SLINKY |
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 |
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Sticky Stars
Plus asteroids, comets, nebulae and the odd galaxy. The Cosmic pack has (95) of the latter assortment, most of them an inch or so in diameter. All self-adhesive, all glow-in-the-dark. Create a little universe of your own on the ceiling or, when you need a costume, just stick everything on your face. Tell people you're star-struck.
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36253 COSMIC STICKERS |
You're a Doll
And you need a backyard. So you can get out of the dollhouse once in a while, maybe entertain, sunbathe, garden a little. Our yard is about 1/12 scale, 18-1/2" x 13-1/4" with a 2" wooden fence and a latching gate, plus a winding path. Comes complete with a pair of long wooden planters to hang on the fence, another pair of 3-1/2" dia polyresin planting tubs that you could actually plant in, a 6" tall tool shed with a metal rake and shovel hanging on it, a round black metal table with (2) patio chairs, a birdbath (with bird), birdhouse on a pole, wheelbarrow, watering can, and (1) tiny, but entrancing, frog. All the fun of landscape design for the dollhouse crowd, but without the worms.
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36870 DOLLHOUSE GARDEN |
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 |
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