Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length Length_150mm six steel wires carrying 20

six steel wires carrying 20 beads each for hands-on instruction in counting

5 to 11 inches through hand-crank control

The system includes: rich activities software

Electric art electrolysis kit creates patterns through electrochemical reactions for 5 demonstrations of redox principles and surface chemistry

and deposition-process discussion

Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length Length_150mm six steel wires carrying 20Long focal double convex glass lens at 75mm diameter and 300mm focal length, the f 4 geometry pushing focal point well downrange for projection style image formation demos.