6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics exposing the full urinary tract

exposing the full urinary tract for combined anatomy and physiology teaching at 15 by 9 inches

this Wimshurst generator builds a visible high-voltage spark

Entry-level two-part human skull model separates the skull cap to reveal the cranial cavity for introductory head-anatomy teaching at secondary and college levels

and bladder in anatomical position

5 inch dimensions in brass

6-Piece Optical Lens Set, 3", Double Convex and Double Concave Physics_Mechanics exposing the full urinary tractSix piece 3 inch optical lens set combining three double convex and three double concave glass lenses at 200mm, 300mm, and 500mm focal lengths for comparative refraction experiments.