
Optical grade unsilvered glass prism from Uncle's WWII tank periscopes. This one is 2-1/8" on the hypotenuse, 5-3/4" long, and 1-1/2" on each leg. They may come with small non-interfering chips or surface scratches. Great for classroom experiments or for art projects. These are a true surplus find and they will not last forever so get yours today!
![]() |
3538 MINI-MONSTER PRISM |
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
It's 1953 all over again! Now you can buy your favorite childhood toy for your grandkids! We have the original Burp Gun that rapid-fires small ping-pong-type balls the length of our office as fast as we can pump the barrel (no batteries needed). All right, we remember the grip of the original as plain old brown plastic, and this one is bright red - but kids are used to a lot more stimulation these days! The Burp Gun, which comes with 15 balls, is 30" long when fully extended. The Burp Pistol, which comes with 7 balls, is 12" at its smallest and extends to 17". Great fun - but maybe you'd better buy a couple of bags of extra balls (10 per bag). Big sisters still stomp on them.
![]() |
92020 BURP GUN | |
![]() |
92021 BURP PISTOL | |
![]() |
92022 EXTRA BALLS |
Another oldie but goodie. 5" high evacuated clear glass stand 3" in diameter at the top. A four bladed vane is balanced on a needle inside the sphere. Because opposite surfaces of the vanes are black and white, incident radiant energy is absorbed or reflected to a different degree. The result is a spinning vane. The brighter the light, the faster it spins. Simple, but compelling. Brief explanatory instruction sheet included.
![]() |
3817P1 RADIOMETER | |
![]() |
3817P2 RADIOMETER 2 PACK SAVINGS |
WARNING: CHOKING HAZARD-Small Parts. Not for children under 3 yrs.
Look! Up in the sky! It's a screeching flying monkey to the rescue! And at a screechingly low price. Our hero is an 11" long stuffed monkey in superhero togs (a cape, and maybe a mask or hood, depending on his sartorial whim). Put two fingers in the little pockets on his paws, pull his bungee arms back, and let him go. He'll fly a good 25 feet or more, issuing hideous monkey screeches all the while, faster than a flying nun and able to brighten up a day in the office in a single bound.
![]() |
93041P1 SCREAMING MONKEY | |
![]() |
93041P3 SCREAMING MONKEY 3 PACK SAVINGS |
Click a phrase to shop for products associated with that phrase (AKA "Tag"). More popular tags appear bigger. Learn more »