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 mini single knife switch allows for a circuit to be live or to be turned off. Simply connect the ends of the circuit to the metal screw contacts on the switch and instantly you have a mechanical way of breaking and connecting a circuit.
Build your own windmill generator kit by recycling a plastic bottle!
Comprehensive collection of 30 fossils.
A combination of three of our great discovery toys, all in one package!
This classic device is used to demonstrate the conservation of mechanical energy.
Watch shape memory alloy technology in action with this solar-powered kit!
Build an electromagnet, an electrical catapult, a doorbell chime, a telegraph, and more with this kit!