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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 |
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 |
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 |
Snazzy Little Notebooks
With ballpoint pens. The covers are approx 4" square x 1/2" thick in metallic leatherette vinyl with snap closures. Inside is a 4" black-ink pen in a keeper, a 64-sheet pad of white notepaper, and a small sleeve to hold finished notes or business cards. So snazzy that they're pre-priced at $6.50. We'll pick an assortment of (3) in black, silver, copper, purple or teal (at least 2 different colors). Take advantage of the Classroom Pack if you're looking for a nice school or office giveaway.
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38454P3 NOTEBOOK | |
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38454P72 NOTEBOOK CLASSROOM PACK |
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What's Red, Black & Blue?
A cardinal after a gang fight. Also our blue-barreled, black-ink ballpoint pen with the red laser pointer built into the top. Measures 5-1/4" long and comes with (3) button cell batteries. Why the cheap price? These have logo misprints on the barrel. Don't stand up in the front of the room without it.
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37922 RED LASER POINTER |
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