Optically Worked Double Convex Glass Lens, 200mm Focal Length, 38mm Diameter Features_Spout sized for resistivity experiments and

sized for resistivity experiments and rheostat construction where small-cross-section copper-nickel is required

exposing every wire and hammer so students trace the bell's electromagnetic action

stable triggering to 30 MHz

Taenia solium tapeworm model demonstrates parasitic anatomy

Color-coded spine and pelvis model differentiates cervical

Optically Worked Double Convex Glass Lens, 200mm Focal Length, 38mm Diameter Features_Spout sized for resistivity experiments andOptically worked glass double convex lens with a 200mm focal length and 1. 5 inch diameter, polished and ground for image formation and refraction demonstrations in physics.