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.
Working model representing the sun, earth, and moon and their relationships.
This ultimate chemistry set features 250 mind-boggling experiments!
Head into the lab for an in-depth investigation of genetics and DNA!
Easily assemble a working alarm motion detector!
This high precision gyroscope will amaze you with rotational speed and ease of precision.
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.
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