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.
This great rock tumbling kit comes with everything you need to polish stones and gems!
A combination of three of our great discovery toys, all in one package!
This 10 inch realistic model has removable organs that can be studied and set back into the correct position!
Learn all about the science of light, optics and visual perception with this wonderful kit!
The Wimshurst Machine is a high quality static machine for student labs.
A beautiful desk or bookshelf accessory for the reading fanatic in your family!