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Ground Glass
One wiseacre assumed we meant any package leaving our shipping room that once had a glass object in it. That is a malicious rumor. . . Ground glass is thin plate glass, the surface of which has been physically ground or acid-etched to create a grainy, grayish, opaque surface. Use it to produce an image from a lens or lens system. Even a simple magnifier, held between the ground glass and, say, a window, will produce an image of the window scene on the ground glass. Ground glass has another magical property: it is opaque to any object viewed at a distance, but not if that object is in direct contact with the glass surface. A necessary element of your optical education. #2728 (square) is 2"sq x 1/32" thick. #2610 (rectangular) is 3-1/2" x 4-3/8" x 1/16" thick.
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2610 RECT. GND. GLASS | |
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2728 SQUARE GND. GLASS |
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Teutonic Noise
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
This well-made plastic siren/whistle, a touch over 3/4" in diameter and a similar touch under 2" long, has a perforated metal disk that rotates in response to a silent blast from the perpetrator's lungs. This creates a high-pitched, loud and certainly distinctive siren-sound that picks up pitch in relation to the air velocity, sustains it as long as your wind holds out, and winds down quickly thereafter. A fine way to signal your arrival or departure. Probably not loud enough to collect the clan at the beach, but loud enough to get their attention in the classroom! The size makes it hard, but not impossible, to swallow, so please use care in teaching youngsters to sound like a miniature air raid siren.
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10345 SIREN WHISTLE |
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Survival Kit
Someday when you're lost in the woods, you'll be very, very glad you ordered this compact survival kit. It's the classic camp director's whistle, raised to new heights. The 4-1/2" x 1-1/8" dia orange-plastic treasure hangs around your neck on a yellow nylon cord. On one end, the whistle. On the other, a compass. Unscrew the compass, and it reverses to a signal mirror, and reveals a 2-1/2" deep waterproof compartment for aspirin or medicinal brandy - or for the matches you're going to strike against the 3/4" long sparker. No, it's not overkill for a teacher to wear it on the playground. 'S cool.
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91897 WHISTLE/COMPASS |
Tap/Die Set
Small, but mighty useful if you need a tiny tap and die set for threading wire or stripped screws. The micro set has a 3-1/4" long die plate and 14 taps (sizes 7 through 20 -- read 0.7 mm through 2.0 mm), and a mighty attractive price. A little oily in its vinyl storage pouch -- but it's all steel, after all, and has to safeguard its complexion.
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92197 MICRO TAP/DIE SET |
Nature Abhors A Vacuum
But science teachers can't work without them. Experiment with this good-quality manual vacuum pump made of durable polychloroethylene plastic. Works with a pistol-grip action and pulls up to 2" Hg. Includes a 17" length of clear vinyl, 1/4" ID tubing, and a release valve.
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93305 VACUUM HOME PUMP |
Just Up To Rubidium
That'd fill this 9-oz ceramic coffee mug with the periodic table of elements printed on the side to about half a cup. It's printed in color on both sides, actually, in case you're left-handed. The atomic numbers and weights are a trifle small, but then they are atomic.
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93658 PERIODIC CHART MUG |
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