Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Capacity_125mL the cylindrical concave curvature spreading

the cylindrical concave curvature spreading light along a single axis for line-focus and divergence demos

Spring-loaded vinyl jaws open to 2

Illustrates liquid-density changes with temperature using a weighted 75mm hollow copper sphere that floats in 15°C water and sinks as the water warms to 30°C

suited to transferring crucibles around open-flame chemistry work

Optically Worked Double Convex Glass Lens, 75mm Diameter, 300mm Focal Length, Alternate Model Capacity_125mL the cylindrical concave curvature spreadingAlternate model 75mm double convex glass lens at 300mm focal length, the optically worked surfaces and ground polished edges parallel to the main line 300mm focal lens for backup stock use.