Knife switches are most closely associated with horror films set in the 1800s, especially in underground laboratories such as the one depicted in Mary Shelley’s novel Frankenstein. This double knife-double throw switch allows for up to two circuits to be live or to be turned off. Simply connect the ends of the circuit to the two metal screw contacts on the switch and instantly you have mechanical way of breaking and connecting a circuit.
See the solar system in action!
Illuminate both your room and your mind with this ingenious Periodic Table Lamp.
Build your own 10 inch kaleidoscope with this great kit!
Easily assemble a working alarm motion detector!
The Hoberman Sphere expands and contracts with a magical motion so fluid and simple that kids can't help but play with it for hours.
Comprehensive collection of 30 fossils.
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