Energy Tube, teaching resource for an array of scientific concepts: open and closed circuits, conductors vs. Insulators, light waves, sound waves,currents, and energy, When a conductor touches both of the electrodes on tube, tube emits a sound and flashing red/green/blue LED lights
Bimetallic Strip Demonstration, Single Piece Non-Jointed Bimetallic Strip Of With Wooden Handle, The Metals Are Distinct And Visible. An Improved Version Of The Rivetted Form. Metals Are Copper And Steel.