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.
Explore the invisible and amazing power of magnets with 33 engaging experiments and games.
This classic device is used to demonstrate the conservation of mechanical energy.
Build a model green house and 9 other green energy-related devices with this great kit!
Get this great introductory chemistry kit for your favorite young scientist!
Small booklet that gets you started in the wonderful world of rocks, minerals and crystals.
Check out this high-quality gyroscope!