Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts Pairs with the Malvern turbine/pump

Pairs with the Malvern turbine/pump unit through two basins and shaped glass tubes on a stand

Compact metal-box convection demonstrator at 10 by 4 by 3 inches with two glass chimneys

walls revealing fluid levels behind the depth-dependent pressure jets

this enlarged Hydra dissection model reveals internal anatomy

students filling the cavity with water or other liquids to study Snell's law and refraction-index variation by medium

Optically Worked Double Concave Glass Lens, 75mm Diameter, 150mm Focal Length Gifts Pairs with the Malvern turbine/pumpOptically worked double concave glass lens at 75mm diameter and 150mm focal length, the diverging curvature producing virtual upright images for refraction and beam spreading work.